linux-firmware: move firmware file for mt7601u

The firmware file for mt7601u (MediaTek MT7601U Wireless MACs) has
been moved to the mediatek/ folder by commit
 8451c2b1 mt76xx: Move the old Mediatek WiFi firmware to mediatek

Address this by updating the location of the firmware file in our
linux-firmware Makefile generating the mt7601u-firmware package.

All other MediaTek Wi-Fi firmware files are supplied by OpenWrt's
own repository rather than being taken from linux-firmware.

Fixes: d53fe5d9ce ("linux-firmware: update to 20230515")
Signed-off-by: Daniel Golle <daniel@makrotopia.org>

package/firmware/linux-firmware/mediatek.mk

@@ -1,9 +1,9 @@
 Package/mt7601u-firmware = $(call Package/firmware-default,MediaTek MT7601U firmware)
 define Package/mt7601u-firmware/install
-	$(INSTALL_DIR) $(1)/lib/firmware
+	$(INSTALL_DIR) $(1)/lib/firmware/mediatek
 	$(INSTALL_DATA) \
-		$(PKG_BUILD_DIR)/mt7601u.bin \
-		$(1)/lib/firmware
+		$(PKG_BUILD_DIR)/mediatek/mt7601u.bin \
+		$(1)/lib/firmware/mediatek
 endef
 $(eval $(call BuildPackage,mt7601u-firmware))