soc: msm8994: Add new power on sequence for ARM cores in 8994

MSM8994 has a different power on sequence for its ARM cores
as compared to the other ARM chipsets. Provide this sequence
and as part of it create new cpu ops and enable-method as well.

Change-Id: Ib63d2a8333a4284db2760f82326068945f568826
Signed-off-by: Rohit Vaswani <rvaswani@codeaurora.org>