ARM: dts: msm: Add the MEM ACC and CPR regulator node for MSM8940

Add the MEM ACC configuration for all the APC corners. Also,
keep APC CPR in open-loop configuration.

CRs-Fixed: 1004013
Change-Id: I7e36ab9c19d2fb02f1bc4c62ea118114b9410d82
Signed-off-by: Anirudh Ghayal <aghayal@codeaurora.org>