Bluetooth: Clear advertising cache before scanning

The LE advertising cache should be cleared before performing a LE
scanning. This will force the cache to contain only fresh advertising
entries.

Signed-off-by: Andre Guedes <andre.guedes@openbossa.org>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
diff --git a/include/net/bluetooth/hci.h b/include/net/bluetooth/hci.h
index 9317798..bd285c6 100644
--- a/include/net/bluetooth/hci.h
+++ b/include/net/bluetooth/hci.h
@@ -710,6 +710,12 @@
 	__u8     le_max_pkt;
 } __packed;
 
+#define HCI_OP_LE_SET_SCAN_ENABLE	0x200c
+struct hci_cp_le_set_scan_enable {
+	__u8     enable;
+	__u8     filter_dup;
+} __packed;
+
 #define HCI_OP_LE_CREATE_CONN		0x200d
 struct hci_cp_le_create_conn {
 	__le16   scan_interval;