Revert "msm_fb: display: wait4vsync before set suspend flag"

This reverts commit 4424e218c35a93266f145e184db62fc2d7ab9390.
Revert "msm_fb: display: wait4vsync after timing generator is turned off"

This reverts commit f1986e7825583b8c91e4ed7f6fcdaa119ea84362.
Revert "msm_fb: display: replace msleep with wait4vsync"

This reverts commit d3deb67d71b55458c81c4654649b1053b87c9417.