msm: IPA: stop ODL GSI channel when PC happens

In current code, when PC happens, ODL GSI channel is still in started
state, and when new DL packet coming, GSI isr will happens, since
nobody is voting for IPA, GSI will not able to handle this isr and
do a silent return. This sequence is causing the GSI irq storm.

Change-Id: I1b17b83d0dee27b0e2851c6bf96907c66773cc60
Signed-off-by: Bojun Pan <bojunp@codeaurora.org>