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: I55011933d92d29e19cc478ed1dbea9d08b95d239
Signed-off-by: Ashok Vuyyuru <avuyyuru@codeaurora.org>