msm: ipa: Race condition fix to avoid missing GSI interrupts

Changes to set the gsi poll mode before/after
enabling/disabling interrupts to avoid a race
condition with missing GSI interrupts.

Change-Id: Idcc569e62cc91bea8ebc581eb46d1903e2021d0b
CRs-Fixed: 2092580
Acked-by: Jyothi Jayanthi <jyothij@qti.qualcomm.com>
Signed-off-by: Michael Adisumarta <madisuma@codeaurora.org>