msm: ipa: Send state changed event from IPA RM

In case that producer is granted synchronously, notify all
registered clients. This change is required as there was an IPA RM
client which didn't get the notification when required.

Change-Id: If400c5d4c48ae856a39277cfd1bdc4c27bf67372
Signed-off-by: Vladislav Mordohovich <vmordoho@codeaurora.org>