NFC: trf7970a: Add DTS Documentation

Describe the properies used by the trf7970a
RFID/NFC/15693 transceiver driver.

Signed-off-by: Mark A. Greer <mgreer@animalcreek.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
diff --git a/MAINTAINERS b/MAINTAINERS
index b2cf5cf..ec12265 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -6067,6 +6067,7 @@
 F:	include/uapi/linux/nfc.h
 F:	drivers/nfc/
 F:	include/linux/platform_data/pn544.h
+F:	Documentation/devicetree/bindings/net/nfc/
 
 NFS, SUNRPC, AND LOCKD CLIENTS
 M:	Trond Myklebust <trond.myklebust@primarydata.com>