msm: ipa: Fix to add string NULL terminator

Missing null terminator to userspace provided
string leads to strlen buffer overflow in strlcpy function.
Added code changes to fix string NULL terminator issue.

Change-Id: I3f9d5f22fbb26f68de12370bc5e07a4e6bc2ced9
Acked-by: Ashok Vuyyuru <avuyyuru@qti.qualcomm.com>
Signed-off-by: Mohammed Javid <mjavid@codeaurora.org>