drm/msm/sde: Fix NOC error in vsync handler

There are cases where MDP clocks switches off and then
mod timer triggers vsync handler where auto refresh config
register is accessed with clock disabled. This results in
NOC error and then resulting in system crash. Fix the issue
by adding resource control while accessing the auto refresh
config register.

Change-Id: I742775d32bf422c8a073d86530a36b724f16486f
Signed-off-by: Jayant Shekhar <jshekhar@codeaurora.org>