msm: mhi_dev: Fix clearing control interrupt

Update mask to clear the control interrupt including
the doorbell write interrupt. Without clearing this
interrupt it shows up as pending when restoring the
MHI registers as part of transition from D3 state to D0.

Change-Id: I3110ddf2c8500af54656dc80b71718288ecdb4c1
Signed-off-by: Siddartha Mohanadoss <smohanad@codeaurora.org>