msm: ipa: Fix to handle IPA API's gracefully for non-IPA targets

Make changes to check whether IPA is initialized or not before
processing the API's.

Change-Id: Id527868c76f8d77d5dc21563ba34003e2694b5d1
Acked-by: Chaitanya Pratapa <cpratapa@qti.qualcomm.com>
Signed-off-by: Ravinder Konka <rkonka@codeaurora.org>