fix(build): disable ENABLE_FEAT_MPAM for Aarch32

Disable FEAT_MPAM support for Aarch32 as it is not supported, following
[1]. ENABLE_FEAT_MPAM is set to 2 by default for Aarch64 in
arch_features.mk, eliminating the need for duplication in the platform
makefile.

[1] https://review.trustedfirmware.org/c/TF-A/trusted-firmware-a/+/23710

Change-Id: I1c8b6844254e00e6372900f1c87f995f292ae65c
Signed-off-by: Harrison Mutai <harrison.mutai@arm.com>
2 files changed