NFC: Add proper guards around pn547.h header

Change-Id: I188000ce7c5518f09290c8ef3ee86c71f57f1b9e
NFC: Copy pn547.h header as pn544.h

* Userspace expects this to be exported as pn544.h

Change-Id: I9bf54b7c27d159237a0a6c52b9c4d462e10c663b