msm: vidc: aggregate ocmem bandwidth for low-power mode

during low power mode, ocmem load was not aggregated leading to
lower performance when low power mode was set. This change adds
the aggregating of load during low power mode.

Change-Id: I17cefd2d9bfa54d5a497e01d03b39af9c92c11e5
Signed-off-by: Ashray Kulkarni <ashrayk@codeaurora.org>