msm: mdss: Remove explicit call to disable esd thread

Esd thread will automatically be disabled using fb notifier when
display is off. So, remove explicit call to disable esd in display off
sequence to avoid mutex deadlock.

Change-Id: Ifc7f7f32e0881fa49ea816150f2b55f41a5ff9a3
Signed-off-by: Vishnuvardhan Prodduturi <vproddut@codeaurora.org>