[TEMPHACK] ci: .shippable.yml: remove some build steps to upload cache

Building with an empty cache currently takes more than one hour which
causes a timeout (Open Source project are allowed a maximum of 1h build
time). As a result, the first build cannot succeed and since the cache
is only saved on success by default, the next build is not faster and
fails as well.

As a workaround,  remove some build steps to allow for a faster build
and therefore populate the cache for the next full builds. Forcing a
build of this branch should hopefully re-create the cache if needed.

Use until [1] is addressed.

Link: [1] https://github.com/Shippable/support/issues 3838
Signed-off-by: Jerome Forissier <jerome.forissier@linaro.org>
diff --git a/.shippable.yml b/.shippable.yml
index bd3b26c..368ae84 100644
--- a/.shippable.yml
+++ b/.shippable.yml
@@ -63,82 +63,3 @@
     - _make PLATFORM=vexpress-juno CFG_ARM64_core=y
     - _make PLATFORM=hikey
     - _make PLATFORM=hikey CFG_ARM64_core=y
-    - _make PLATFORM=mediatek-mt8173 CFG_ARM64_core=y
-    - _make PLATFORM=imx-mx6ulevk
-    - _make PLATFORM=imx-mx6ulevk CFG_NXP_CAAM=y
-    - _make PLATFORM=imx-mx6ul9x9evk
-    - _make PLATFORM=imx-mx6ullevk
-    - _make PLATFORM=imx-mx6ulzevk
-    - _make PLATFORM=imx-mx6slevk
-    - _make PLATFORM=imx-mx6sllevk
-    - _make PLATFORM=imx-mx6sxsabreauto
-    - _make PLATFORM=imx-mx6sxsabresd
-    - _make PLATFORM=imx-mx6sxsabresd CFG_NXP_CAAM=y
-    - _make PLATFORM=imx-mx6solosabresd
-    - _make PLATFORM=imx-mx6solosabreauto
-    - _make PLATFORM=imx-mx6sxsabreauto
-    - _make PLATFORM=imx-mx6qsabrelite
-    - _make PLATFORM=imx-mx6qsabresd
-    - _make PLATFORM=imx-mx6qsabresd CFG_RPMB_FS=y
-    - _make PLATFORM=imx-mx6qsabreauto
-    - _make PLATFORM=imx-mx6qsabreauto CFG_NXP_CAAM=y
-    - _make PLATFORM=imx-mx6qpsabreauto
-    - _make PLATFORM=imx-mx6qpsabresd
-    - _make PLATFORM=imx-mx6dlsabresd
-    - _make PLATFORM=imx-mx6dlsabreauto
-    - _make PLATFORM=imx-mx6dapalis
-    - _make PLATFORM=imx-mx6qapalis
-    - _make PLATFORM=imx-mx7dsabresd
-    - _make PLATFORM=imx-mx7dsabresd CFG_NXP_CAAM=y
-    - _make PLATFORM=imx-mx7ulpevk
-    - _make PLATFORM=imx-mx8mmevk
-    - _make PLATFORM=imx-mx8mmevk CFG_NXP_CAAM=y
-    - _make PLATFORM=imx-mx8mnevk
-    - _make PLATFORM=imx-mx8mqevk
-    - _make PLATFORM=imx-mx8qxpmek
-    - _make PLATFORM=imx-mx8qmmek
-    - _make PLATFORM=k3-j721e
-    - _make PLATFORM=k3-j721e CFG_ARM64_core=y
-    - _make PLATFORM=k3-am65x
-    - _make PLATFORM=k3-am65x CFG_ARM64_core=y
-    - _make PLATFORM=ti-dra7xx out/core/tee{,-pager,-pageable}.bin
-    - _make PLATFORM=ti-am57xx
-    - _make PLATFORM=ti-am43xx
-    - _make PLATFORM=sprd-sc9860
-    - _make PLATFORM=sprd-sc9860 CFG_ARM64_core=y
-    - _make PLATFORM=ls-ls1021atwr
-    - _make PLATFORM=ls-ls1021aqds
-    - _make PLATFORM=ls-ls1043ardb
-    - _make PLATFORM=ls-ls1046ardb
-    - _make PLATFORM=ls-ls1012ardb
-    - _make PLATFORM=ls-ls1012afrwy
-    - _make PLATFORM=ls-ls1028ardb
-    - _make PLATFORM=ls-ls1088ardb
-    - _make PLATFORM=ls-ls2088ardb
-    - _make PLATFORM=ls-lx2160ardb
-    - _make PLATFORM=zynq7k-zc702
-    - _make PLATFORM=zynqmp-zcu102
-    - _make PLATFORM=zynqmp-zcu102 CFG_ARM64_core=y
-    - _make PLATFORM=d02
-    - _make PLATFORM=d02 CFG_ARM64_core=y
-    - _make PLATFORM=rcar
-    - _make PLATFORM=rcar CFG_ARM64_core=y
-    - _make PLATFORM=rpi3
-    - _make PLATFORM=rpi3 CFG_ARM64_core=y
-    - _make PLATFORM=hikey-hikey960
-    - _make PLATFORM=hikey-hikey960 COMPILER=clang
-    - _make PLATFORM=hikey-hikey960 CFG_ARM64_core=y
-    - _make PLATFORM=hikey-hikey960 CFG_ARM64_core=y COMPILER=clang
-    - _make PLATFORM=hikey-hikey960 CFG_SECURE_DATA_PATH=n
-    - _make PLATFORM=poplar
-    - _make PLATFORM=poplar CFG_ARM64_core=y
-    - _make PLATFORM=rockchip-rk322x
-    - _make PLATFORM=sam
-    - _make PLATFORM=marvell-armada7k8k
-    - _make PLATFORM=marvell-armada3700
-    - _make PLATFORM=synquacer
-    - _make PLATFORM=sunxi-bpi_zero
-    - _make PLATFORM=sunxi-sun50i_a64
-    - _make PLATFORM=bcm-ns3 CFG_ARM64_core=y
-    - _make PLATFORM=hisilicon-hi3519av100_demo
-    - _make PLATFORM=amlogic