refactor(cpus): convert the Cortex-A78 to use cpu helpers

Change-Id: I3a65815cee9f78acb79b86990d20cf936aee7023
Signed-off-by: Govindraj Raja <govindraj.raja@arm.com>
(cherry picked from commit 0a3274591a9b3beba9ff4729dd2ea6bd9a597ff1)
1 file changed