msm_fb: display: add wfd suspend/resume to early suspend

wfd on/off was handled by fb_on/fb_close which are called from video
or userspace side. However, this is not the case for this branch. mdp
driver has to register wfd for suspend to make sure proper panel
on/off happen.

Change-Id: If1836598e5ae95e4b2b72e40dc85784a0d20c843
Signed-off-by: Huaibin Yang <huaibiny@codeaurora.org>