NFC: Export nfc_hci_sak_to_protocol()

Some HCI drivers will need it.

Signed-off-by: Eric Lapuyade <eric.lapuyade@intel.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
diff --git a/include/net/nfc/hci.h b/include/net/nfc/hci.h
index 150e3ca..671953e 100644
--- a/include/net/nfc/hci.h
+++ b/include/net/nfc/hci.h
@@ -237,5 +237,6 @@
 int nfc_hci_send_event(struct nfc_hci_dev *hdev, u8 gate, u8 event,
 		       const u8 *param, size_t param_len);
 int nfc_hci_target_discovered(struct nfc_hci_dev *hdev, u8 gate);
+u32 nfc_hci_sak_to_protocol(u8 sak);
 
 #endif /* __NET_HCI_H */