refactor(cpus): convert the Cortex-A73 to use the cpu helpers

Change-Id: I910c657b3064b8e19eb84656109074ddf0e4ece8
Signed-off-by: Sona Mathew <SonaRebecca.Mathew@arm.com>
(cherry picked from commit 51e9eb101e45cc60819c623d63db1a0308721981)
1 file changed