msm:ipa: Fix to kasan use-after-free issue

Added mutex lock to query rt table function also to sync
with other ioctl calls in ipa.
Change-Id: I65d46c0ef28b5e6260c92473fd15e9763de20146
Acked-by: Ashok Vuyyuru <avuyyuru@qti.qualcomm.com>
Signed-off-by: Mohammed Javid <mjavid@codeaurora.org>