disp: msm: sde: increase rsc min_threshold time

Increase the rsc min_threshold time, so that it has
sufficient time to complete the sequencer in rare
cases. Increase the polling time for tcs ok
from 1us to 3us to align with the min_threshold.

Change-Id: I8ebe250823969e55ec2ec4bb9f8f55bf4aa52aa5
Signed-off-by: Veera Sundaram Sankaran <veeras@codeaurora.org>