bionic-amd64-tf-a-build: Add gcc-arm-none-eabi for M-series

The gcc cross-compiler GNU Arm Embedded Toolchain 10-2020-q4-major
is added in bionic-amd64-tf-a-build to allow builds for 32-bit
Arm Cortex-M processors (i.e. SCP-Firmware).

Signed-off-by: Nicola Mazzucato <nicola.mazzucato@arm.com>
Change-Id: Icfcc9f31034847a77cf614d786bea0dd581c7467
1 file changed