msm: vidc: Fix DSP queue initialization

Set DSP queue enablement bit in control init value
to inform video firmware about DSP queue enablement.
Fix DSP uncached region size which needs to be aligned
by 1MB as expected by video firmware.

Change-Id: If4948191c89253dce5924ec6d74b2e8cb0562218
Signed-off-by: Maheshwar Ajja <majja@codeaurora.org>