msm: ipa4: Fix to mask the global interrupt INT1

Receiving the global interrupt INT1 without sending any
generic commands. So disabling interrupt by default.
Enabling the interrupt only before sending the generic command.

Change-Id: I248e68e1704e029e5659b1a800dff9a3b3bfaedf
Acked-by: Ashok Vuyyuru <avuyyuru@qti.qualcomm.com>
Signed-off-by: Mohammed Javid <mjavid@codeaurora.org>