Bluetooth: mgmt: Fix timeout type

Silence sparse warnings:
net/bluetooth/mgmt.c:865:19: warning: cast to restricted __le16

Signed-off-by: Andrei Emeltchenko <[e-mail]>
Acked-by: Marcel Holtmann <[e-mail]>
Signed-off-by: Gustavo Padovan <[e-mail]>

include/net/bluetooth/mgmt.h

···
 #define MGMT_OP_SET_DISCOVERABLE	0x0006
 struct mgmt_cp_set_discoverable {
 	__u8	val;
-	__u16	timeout;
+	__le16	timeout;
 } __packed;
 #define MGMT_SET_DISCOVERABLE_SIZE	3