CI: Switch to Linaro release 20.01 binaries

This patch provides changes for usage of the latest
Linaro release 20.01 binaries available at
https://releases.linaro.org/members/arm/platforms/20.01/

Signed-off-by: Alexei Fedorov <Alexei.Fedorov@arm.com>
Change-Id: If43927c9d42b3b5bfb783565f7ba25414ccafa34
diff --git a/fvp_utils.sh b/fvp_utils.sh
index b511a5f..c345af7 100644
--- a/fvp_utils.sh
+++ b/fvp_utils.sh
@@ -31,7 +31,7 @@
 
 uboot32_fip_url="$linaro_release/fvp32-latest-busybox-uboot/fip.bin"
 
-rootfs_url="$linaro_release/lt-vexpress64-openembedded_minimal-armv8-gcc-4.9_20150912-729.img.gz"
+rootfs_url="$linaro_release/lt-vexpress64-openembedded_minimal-armv8-gcc-5.2_20170127-761.img.gz"
 
 # FVP Kernel URLs
 declare -A fvp_kernels