M2: (FIXUP): msm: pm: Update spm retention sequence to support per core retention

On krait revision < 3, power driver is not using full spm sequence and
calling into trustzone as a part of executing krait retention.
Also krait retention is not supported on secondary cores.

krait pass3 is upgraded to use full spm sequence, hence add support
for per core retention and avoid calling into trustzone
while executing retention.

*detule: sync to 8960 board file.  Previous version of this patch that I
brought from msm-3.4 didn't have the full spm register update.  The
jb_2.5 version of the patch did.

CRs-fixed: 437281
Change-Id: I6a2b3d7c4d0fd5b9a340957b16b940b7a09bbd91
Signed-off-by: Anji Jonnala <anjir@codeaurora.org>
Signed-off-by: Venkat Devarasetty <vdevaras@codeaurora.org>