Move trusted firmware repo to new location

Transition to the new trusted firmware repo location at
http://git.trustedfirmware.org.

NOTE: The 'arm-trusted-firmware' instances under zynqmp* have not
been changed.

Signed-off-by: Victor Chong <victor.chong@linaro.org>
Reviewed-by: Etienne Carriere <etienne.carriere@linaro.org>
Reviewed-by: Joakim Bech <joakim.bech@linaro.org>
diff --git a/poplar.mk b/poplar.mk
index afeca04..2666438 100644
--- a/poplar.mk
+++ b/poplar.mk
@@ -24,7 +24,7 @@
 
 OUT_PATH		?= $(ROOT)/out
 ROOTFS_BIN		?= $(ROOT)/out-br/images/rootfs.tar
-TF_A_PATH		?= $(ROOT)/arm-trusted-firmware
+TF_A_PATH		?= $(ROOT)/trusted-firmware-a
 LLOADER_PATH		?= $(ROOT)/l-loader
 UBOOT_PATH		?= $(ROOT)/u-boot
 OPTEE_CLIENT_EXPORT	?= $(OPTEE_CLIENT_PATH)/out/export