msm: vidc: Fix for fuzz OCMEM packet issue

Firmware is reporting session error while setting
OCMEM resource due to incorrect packet sizes being
expected. Fix this by compensating the size of the
packet that is been provided to FW.

Change-Id: I6cecad037e2673a96f152289308a9d26bb4beb5a
Signed-off-by: Jorge Solano Altamirano <jsolano@codeaurora.org>