rfkill: add the GPS radio type

Althoug GPS is a technology w/o transmitting radio
and thus not a primary candidate for rfkill switch,
rfkill gives unified interface point for devices with
wireless technology.

The input key is not supplied as it is too be deprecated.

Cc: johannes@sipsolutions.net
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Acked-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/net/rfkill/core.c b/net/rfkill/core.c
index 044de1c..dbeaf29 100644
--- a/net/rfkill/core.c
+++ b/net/rfkill/core.c
@@ -589,11 +589,13 @@
 		return "wimax";
 	case RFKILL_TYPE_WWAN:
 		return "wwan";
+	case RFKILL_TYPE_GPS:
+		return "gps";
 	default:
 		BUG();
 	}
 
-	BUILD_BUG_ON(NUM_RFKILL_TYPES != RFKILL_TYPE_WWAN + 1);
+	BUILD_BUG_ON(NUM_RFKILL_TYPES != RFKILL_TYPE_GPS + 1);
 }
 
 static ssize_t rfkill_type_show(struct device *dev,