bionic-amd64-tf-m-build: Adds GNUARM 13.2

Adds support for GNUARM 13.2 (arm-none-eabi-xxx) to the
bionic-amd64-tf-m-build dockerfile definition.

Change-Id: I6930a6e4ee4e2942eb0966298be6073a8af8d6bb
Signed-off-by: Matthew Dalzell <matthew.dalzell@arm.com>
2 files changed