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>
diff --git a/plat/arm/board/arm_fpga/platform.mk b/plat/arm/board/arm_fpga/platform.mk
index c71c99a..f44b37d 100644
--- a/plat/arm/board/arm_fpga/platform.mk
+++ b/plat/arm/board/arm_fpga/platform.mk
@@ -41,7 +41,6 @@
 ENABLE_FEAT_ECV			:= 2
 ENABLE_FEAT_FGT			:= 2
 ENABLE_FEAT_HCX			:= 2
-ENABLE_FEAT_MPAM		:= 2
 ENABLE_SYS_REG_TRACE_FOR_NS	:= 2
 ENABLE_TRF_FOR_NS		:= 2
 
diff --git a/plat/arm/board/fvp/platform.mk b/plat/arm/board/fvp/platform.mk
index 902a5df..ad9ce94 100644
--- a/plat/arm/board/fvp/platform.mk
+++ b/plat/arm/board/fvp/platform.mk
@@ -53,7 +53,6 @@
 	ENABLE_FEAT_AMU			:= 2
 	ENABLE_FEAT_AMUv1p1		:= 2
 	ENABLE_FEAT_HCX			:= 2
-	ENABLE_FEAT_MPAM		:= 2
 	ENABLE_FEAT_RNG			:= 2
 	ENABLE_FEAT_TWED		:= 2
 	ENABLE_FEAT_GCS			:= 2