msm: copper: Low Power Resource manager driver

Code changes to add support for Low Power Resource Manager Driver.
This code will manage PXO, VDD dig and Vdd mem based on the idle
mode the kernel chooses and updates the RPM sleep vote accordingly.

Change-Id: If3af14920e17c010c8e77b550ab57d532b32e6cd
Signed-off-by: Girish Mahadevan <girishm@codeaurora.org>