msm: cvp: Fix cvp session lsof issue

The issue is video driver is using FD to pass buffers to cvp driver.
FD is not designed to be used in this way between kernel drivers,
so dma_buf is used instead.

Change-Id: I14be4971264b34a34b9a592df45d5463dbd2c565
Signed-off-by: Ruofei Ma <ruofeim@codeaurora.org>