feat(rdfremont): enable AMU if present on the platform

Set build-option ENABLE_FEAT_AMU to 2 so that AMU is enabled if the
feature is implemented on the platform. This would ensure that lower ELs
could access system registers relevant to AMU registers without causing
a trap to EL3.

Signed-off-by: Rohit Mathew <rohit.mathew@arm.com>
Change-Id: I567ac9b0d76b613593d37ea45b4955b423ff5e6c
diff --git a/plat/arm/board/neoverse_rd/platform/rdfremont/platform.mk b/plat/arm/board/neoverse_rd/platform/rdfremont/platform.mk
index e6fd569..d30cde6 100644
--- a/plat/arm/board/neoverse_rd/platform/rdfremont/platform.mk
+++ b/plat/arm/board/neoverse_rd/platform/rdfremont/platform.mk
@@ -101,3 +101,4 @@
 
 # Features for RD-Fremont variants
 override ENABLE_FEAT_MPAM	:= 2
+override ENABLE_FEAT_AMU	:= 2