msm: ocmem: Do not use data mover for clearing ocmem memory

In the non secure environment the data mover is used to clear
the ocmem memory. The ocmem driver no longer uses the data
mover for this operation.

Change-Id: I2dc4f421b1a1a81d3205bd57fe66092512e287aa
Signed-off-by: Neeti Desai <neetid@codeaurora.org>