board-8960: Update 8960AB and 8064AB SPM sequences.

8960AB and 8064AB have a new revision of the Krait SPM hardware.
The SPM v1.15x on these targets uses a different bit to control the
apc_pdn signal.
Update the SPM sequences for standalone and power collapse to use the
new sequences.

L2 SPM or Krait WFI/Retention sequences are not affected.

CRs-fixed: 419258
Change-Id: I69ee83ef49cc91c160bf3d24de1f72c8b7b374a6
Signed-off-by: Praveen Chidambaram <pchidamb@codeaurora.org>