msm: spm: Update msm_spm_turn_on_cpu_rail() to use new SAW2 base address

Update the msm_spm_turn_on_cpu_rail() to use SAW2 base addresses passed
from the release_secondary to turn on the cpu rail, before bringing back
the cpu online.

Change-Id: Ic57d3995c42291d9d2f28f03591823056bf0ff41
Signed-off-by: Praveen Chidambaram <pchidamb@codeaurora.org>