Bluetooth: Convert Set SC to use HCI Request

This patch converts the Set Secure Connection HCI handling to use a HCI
request instead of using a hard-coded callback in hci_event.c. This e.g.
ensures that we don't clear the flags incorrectly if something goes
wrong with the power up process (not related to a mgmt Set SC command).

The code can also be simplified a bit since only one pending Set SC
command is allowed, i.e. mgmt_pending_foreach usage is not needed.

Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c
index a58845e..e2b81ad 100644
--- a/net/bluetooth/hci_event.c
+++ b/net/bluetooth/hci_event.c
@@ -525,9 +525,7 @@
 			hdev->features[1][0] &= ~LMP_HOST_SC;
 	}
 
-	if (test_bit(HCI_MGMT, &hdev->dev_flags))
-		mgmt_sc_enable_complete(hdev, sent->support, status);
-	else if (!status) {
+	if (!test_bit(HCI_MGMT, &hdev->dev_flags) && !status) {
 		if (sent->support)
 			set_bit(HCI_SC_ENABLED, &hdev->dev_flags);
 		else