refactor(cpus): convert the Cortex-A76 to use cpu helpers

Change-Id: I9c9dff626f073d762b5c8c2d8286e1654ac5c2e5
Signed-off-by: Govindraj Raja <govindraj.raja@arm.com>
(cherry picked from commit 53e02f2a59416bb707f31eb6d28513590d94648d)
1 file changed