msm: ipa3: Check IPA initialized in modem SSR events

In local modem SSR events not checking if IPA is initialized
or not. Added check to see IPA is initialized.

Change-Id: Ica21a148e5c11cc14e5e4c3bcbd609572b588386
Signed-off-by: Praveen Kurapati <pkurapat@codeaurora.org>