msm: vidc: Update bit depth correctly for encoder

Update bit depth in set format for encoder and use this
update information later when required. Encoder output
size is also adjusted for 10bit cases. For lower QP
the current size is not enough.

Change-Id: Ia82d7ad60030d5051fab07074ff8d2b62473765d
Signed-off-by: Vaibhav Deshu Venkatesh <vdeshuve@codeaurora.org>