video: msm: Fix warnings
drivers/video/msm/mdp4_overlay.c: In function 'mdp4_overlay_commit':
drivers/video/msm/mdp4_overlay.c:4056:3: warning: implicit declaration of function 'mdp4_dsi_cmd_pipe_commit' [-Wimplicit-function-declaration]
drivers/video/msm/mdp4_overlay.c:4059:3: warning: implicit declaration of function 'mdp4_dsi_video_pipe_commit' [-Wimplicit-function-declaration]

01ad4da0df7c000585bff66b056ea0b584765483
modified:   drivers/video/msm/mdp4.h

Signed-off-by: cholokei <leesl0416@naver.com>