msm: mdp: Remove mixer1 blt for external

BLT mode is not needed for external displays since
there is no extra downscaling needed for videos.

Signed-off-by: nobodyAtall <tsogkas@ceid.upatras.gr>
msm_fb: display: silent blending error warning message

If there had no any pipe blending stage changes, then do not
call belnding set up to avoid unnecessary warning messges.

CRs-fixed: 467556
Change-Id: I07520b3b0917375c41405e736dcb9eb8a3daddc1
Signed-off-by: Kuogee Hsieh <khsieh@codeaurora.org>
Signed-off-by: nobodyAtall <tsogkas@ceid.upatras.gr>
msm_fb: Fix adb shell start/stop issue when bypass enabled

Currently when 2/3/4 layer bypass is enabled, doing a adb shell
stop/start is failing overlay and composition happens through
GPU. Fix this issue by proper overlay configuration during this
scenario.

Change-Id: Ia04f1839bf80ed552671e48445af63a4dcd6bdfd
Signed-off-by: Padmanabhan Komanduru <pkomandu@codeaurora.org>
Signed-off-by: nobodyAtall <tsogkas@ceid.upatras.gr>