msm: vidc: Fix wrong variable size for mpeg2_seqdisp_payload

The variable color_descp is not bool; it is defined by Venus
FW API as u32 like all other variables in this structure.

Change-Id: Icaef2292ded03f510f0ecada443c9c5217fc9d79
Signed-off-by: Jorge Solano Altamirano <jsolano@codeaurora.org>