platform:msm_shared: disable DSI ISR for both controller

dsi_off API was disabling DSI ISR for controller-1 by
setting fixed offset. This offset change from target
to target and can cause the boot crash due to enabled
ISR. Fix register offset by selecting respective controller
base address.

Change-Id: I282faebb95e55b64293359ef06a607b62215f460
1 file changed