Build: Explicitly include cpuarch.cmake

Include NS cpuarch.cmake exported by TF-M build to set up CPU/Arch fixed
flags, which might affect other later configurations.
Unnecessary for each toolchain to include cpuarch.cmake respectively.

Signed-off-by: David Hu <david.hu@arm.com>
Change-Id: I1a55037a2afeaf51697559a771976a107b528d79
2 files changed