Revert "Revert "msm_fb: display:  add mdp bandwidth runtime calculation""

This reverts commit a9ebd4e6f8945d7433072aae211bdc6a68bafca9.
msm_fb: display: restore previous mdp bandwidth when resume

mdp resume bandwidth is set to the value when device was suspend, so
that the correct init value is set to avoid underrun.

CRs-fixed: 425823
Change-Id: Ie9b832f0eb5b5e1b6cb5e8979626986d896d340b
Signed-off-by: Huaibin Yang <huaibiny@codeaurora.org>

Conflicts:

	drivers/video/msm/mdp.c
	drivers/video/msm/mdp4_util.c
video: msm: Add multiplier to MDP bandwidth calculation

 * We have major underruns on 8660 without higher bandwidth. Scale it by
   2x to achieve a solid framerate with no underrun.

Change-Id: Iabf9cb12696452a8b51aa818b8e5d6682bac7ed5