msm: mdss: fix tearcheck when enter low power mode

During transition from ultra low power mode to
low power mode, tear check is not reconfigured,
which can cause problems during the doze mode
use case. Fix this problem by making sure
that tearcheck gets reconfigured.

Change-Id: I5dc0dd78d98c768ef70c795ac974bb4574c55a0f
Signed-off-by: Ingrid Gallardo <ingridg@codeaurora.org>