NFC: add NFC socket family

Signed-off-by: Lauro Ramos Venancio <lauro.venancio@openbossa.org>
Signed-off-by: Aloisio Almeida Jr <aloisio.almeida@openbossa.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/include/linux/nfc.h b/include/linux/nfc.h
index 1170476..15f8cb3 100644
--- a/include/linux/nfc.h
+++ b/include/linux/nfc.h
@@ -109,4 +109,7 @@
 #define NFC_PROTO_ISO14443_MASK	(1 << NFC_PROTO_ISO14443)
 #define NFC_PROTO_NFC_DEP_MASK	(1 << NFC_PROTO_NFC_DEP)
 
+/* NFC socket protocols */
+#define NFC_SOCKPROTO_MAX	0
+
 #endif /*__LINUX_NFC_H */