msm: ipa: Add API support for getting IPA SMMU status

for WLAN

This is an API for getting IPA SMMU status, this API
will currently report if IPA SMMU is enabled or not
for WLAN Context Bank.

Change-Id: I9dec309c74043e259aa01ba9a49d9537e9d92208
Acked-by: Jyothi Jayanthi <jyothij@qti.qualcomm.com>
Signed-off-by: Michael Adisumarta <madisuma@codeaurora.org>