ARM: dts: msm: Add SPM and APC CPR regulator nodes for 8909w-pm660

Add SPM regulator node for supporting voltage scaling on VDD_APC rail.
Enable 'bypass-spm' until the SAW support for 16-bit VCTL is enabled.
Add CPR regulator node with the required configuration for VDD_APC rail.

CRs-Fixed: 2037603
Change-Id: I06e2229a656799b079231071945555fdf609d8e2
Signed-off-by: Tirupathi Reddy <tirupath@codeaurora.org>