msm: ocmem: Add support for ocmem power control

Add support for controlling the power state of ocmem memory
macros. Both local power control and RPM assisted power control
are supported.

Also add required support for debugging power control operations.

Change-Id: Ia02c3b90245e808085c3f92fdf5f23044fc04665
Signed-off-by: Naveen Ramaraj <nramaraj@codeaurora.org>