msm: display: panel frame rate report

Add metadata ioctl for retrieving panel frame rate.
Get ready to remove reserved fields usage.

Change-Id: I51a4aed9d85efd5f83a184100b6a3dc682c7a67c
Signed-off-by: Ken Zhang <kenz@codeaurora.org>

Conflicts:
	drivers/video/msm/msm_fb.c
Revert "msm: mdp: Update sync pt. behaviour"

This reverts commit 878e240c6b2092b77d284ec39c75312141bcc1ed.
Revert "msm: mdp: Change msmfb kworker to kthread"

This reverts commit 134d84b8441f2d65beae8450ffc1a4b543662c90.
Revert "msm: display: command mode panel release fence"

This reverts commit f495843273bd08f6cb88e200308e33193d1bcfe4.

Conflicts:
	drivers/video/msm/msm_fb.c

Change-Id: Ia79f552795506a2a03aba10ce07927643daa72e2