msm: vidc: Add memory barrier after before/after queue read/write

Add memory barriers before shared queue read and after shared
queue write to make sure the data received by venus is proper
before raising the interrupt on venus.

Change-Id: I7bab5d7618c232a89dad28d4c65acee6df815145
Signed-off-by: Vinay Kalia <vkalia@codeaurora.org>