NFC: Export target lost function

NFC drivers will call this routine when they detect that a tag leaves the
RF field. This will eventually lead to the corresponding netlink event
to be sent.

Signed-off-by: Eric Lapuyade <eric.lapuyade@intel.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/include/net/nfc/nfc.h b/include/net/nfc/nfc.h
index bac070b..57ea095 100644
--- a/include/net/nfc/nfc.h
+++ b/include/net/nfc/nfc.h
@@ -181,6 +181,7 @@
 
 int nfc_targets_found(struct nfc_dev *dev,
 		      struct nfc_target *targets, int ntargets);
+int nfc_target_lost(struct nfc_dev *dev, u32 target_idx);
 
 int nfc_dep_link_is_up(struct nfc_dev *dev, u32 target_idx,
 		       u8 comm_mode, u8 rf_mode);