msm: ipa3: Fix to validate the user inputs

Adding code changes to validate user inputs.
Before allocating the NAT entry verifying the
NAT entry size in range or not.

Change-Id: I47b97973a3ea66b1627a323f77778b295c7765a4
Acked-by: Ashok Vuyyuru <avuyyuru@qti.qualcomm.com>
Signed-off-by: Mohammed Javid <mjavid@codeaurora.org>