msm: ocmem: Add support for disabling OCMEM power management

For debug purposes add a Kconfig that allows disabling OCMEM
power management operations. When this is enabled all OCMEM
macros are turned ON during init and subsequent transition
requests for power state changes are ignored.

Both local and RPM assisted power management can be used
in combination with this debug mode.

Change-Id: If3a536969de36e11b9664b562d57ad32e2ec8832
Signed-off-by: Naveen Ramaraj <nramaraj@codeaurora.org>