build(rpi3): add build configs for rpi3 mboot dtpm

This is needed to support compilation of new source files
for measured boot with Discrete TPM support, includes
tf-a build config for the Measured Boot DTPM PoC.

Change-Id: I85fc16cb56f72ee426f1cb6665751558510e8b7d
Signed-off-by: Abhi Singh <abhi.singh@arm.com>
3 files changed