feat(plat/sgi): enable AMU for RD-V1-MC

AMU counters are used for monitoring the CPU performance. RD-V1-MC
platform has architected AMU available for each core. Enable the use of
AMU by non-secure OS for supporting the use of counters for processor
performance control (ACPI CPPC).

Change-Id: I33be594cee669e7f4031e5e5a371eec7c7451030
Signed-off-by: Pranav Madhu <pranav.madhu@arm.com>
diff --git a/plat/arm/board/rdv1mc/platform.mk b/plat/arm/board/rdv1mc/platform.mk
index 06a2047..df0b09a 100644
--- a/plat/arm/board/rdv1mc/platform.mk
+++ b/plat/arm/board/rdv1mc/platform.mk
@@ -68,6 +68,7 @@
 $(eval $(call TOOL_ADD_PAYLOAD,${NT_FW_CONFIG},--nt-fw-config,${NT_FW_CONFIG}))
 
 override CTX_INCLUDE_AARCH32_REGS	:= 0
+override ENABLE_AMU			:= 1
 
 ifneq ($(CSS_SGI_PLATFORM_VARIANT),0)
  $(error "CSS_SGI_PLATFORM_VARIANT for RD-V1-MC should always be 0, \