msm: vidc: Use the updated size definition for VPSS

VP9 tests are broken due to wrong VPSS size calculation.
Use the updated size definition provided by video
firmware to fix this.

Change-Id: I6741e988b197396762f6b4ec4b85577c16bc42a4
Signed-off-by: Vaibhav Deshu Venkatesh <vdeshuve@codeaurora.org>