drm/msm/sde: Restarting ESD status check after Doze mode

In the current implementation when display enters Doze mode
ESD status check thread is disabled. When it exits from the
Doze mode an unblank call is made to enable ESD status check
but it is not getting enabled so this change fixes the issue.

Change-Id: Ib59d47c42a91172e630225582341ab335ff03ce3
Signed-off-by: Tharun Raj Soma <tsoma@codeaurora.org>