mt76x0: load firmware from mediatek subdir

Firmware blob will be located in mediatek subdirectory. Add "u" suffix
to indicate this is USB device firmware.
Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/mediatek/mt76/mt76x0/usb.h

@@ -16,7 +16,7 @@
 
 #include "mt76x0.h"
 
-#define MT7610_FIRMWARE	"mt7610.bin"
+#define MT7610_FIRMWARE	"mediatek/mt7610u.bin"
 
 #define MT_VEND_REQ_MAX_RETRY	10
 #define MT_VEND_REQ_TOUT_MS	300