msm: ocmem: Fix routines incorrectly marked as static

The OCMEM header file had few helper routines marked incorrectly
with the static storage class. Fix them by moving the definitions
from the header file to the source file.

Change-Id: I0b385cc24a283113e0f66d0b0769a923aa0a46eb
Signed-off-by: Naveen Ramaraj <nramaraj@codeaurora.org>