Set hci_dev's hw_info field

- Set the hw_info field of our hci_dev structure to mt7668. This allows
the kernel bluetooth stack to identify the chip, and apply workarounds
for broken firmware.

Change-Id: I2b5b628bf737a76da97db3a6bd0d00a32a99be9d
diff --git a/btmtk_sdio.c b/btmtk_sdio.c
index 9c7989d..355aa96 100644
--- a/btmtk_sdio.c
+++ b/btmtk_sdio.c
@@ -3141,6 +3141,7 @@
 	hdev->close    = btsdio_close;
 	hdev->flush    = btsdio_flush;
 	hdev->send     = btsdio_send_frame;
+	hdev->hw_info  = "mt7668";
 
 	ret = hci_register_dev(hdev);
 	if (ret < 0) {