msm: vidc: update video resolution during reconfig event

Video port resolution can be updated during reconfig event itself.
With this, reconfig height and width was removed. Also relevant
code cleanup was made accordingly.

Change-Id: I4fb38563b4c747eb356f28b7df7e99bd397ff8d1
Signed-off-by: Vikash Garodia <vgarodia@codeaurora.org>