libnfc-nxp: Add alternate firmware path

* Check in /system/lib for firmware as well, so we can be bug-for-bug
   compatible with OEMs.

Change-Id: Iea350c3d0a58a1f6012c2a088f8ba6fed4b10365
Stop "LLC length mis-match" log spam

Happens on all Sony fusion3 devices, probably others.
The message is not present in stock libnfc.so, most
probably Sony decided to remove/comment it too.

PS2: change to ALOGV instead...

Change-Id: Ib4faa0c571747a874eb582f411bf464622f25d92