Fix up NFC permissions.

Fix up NFC permissions.

The initial (vendor) implementation had 4 perms, replace with 1.

Requires no permissions:
- Viewing UID, type of discovered tags and cards.
- Viewing the NDEF message contents of NDEF formatted tags and cards.

Requires android.permission.NFC
- Get/Set the local tag "MyTag"
- Creating or using a RawTagConnection (transceive())
- Creating or using a NdefTagConnection (write()/read())

Change-Id: I1b585c7d91738bed6261277061a48cf7c939482a
Signed-off-by: Nick Pelly <npelly@google.com>