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
1 file changed