msm: vidc: update format during downscaling

When downscaling is enabled, update the port format
parameters based on port type.
Avoid updating the instance property during reconfig event
with sufficient resource. V4L2 Client expects downscaled
parameters rather than reconfig parameters.

Change-Id: I629a0b78a56806018976f7f82e8c526fef456ec9
CRs-Fixed: 629474
Signed-off-by: Vikash Garodia <vgarodia@codeaurora.org>