GitLab

As done recently for plat/tc0 in b5863cab

, enable AMU explicitly.
This is necessary as the recent changes that enable SVE for the secure
world disable AMU by default in the CPTR_EL3 reset value.

Change-Id: Ie3abf1dee8a4e1c8c39f934da8e32d67891f5f09
Signed-off-by: Tom Cosgrove <tom.cosgrove@arm.com>