mt76: move mt76x2e firmware to kmod-mt76x2-common and use it for mt76x2u

USB and PCIe devices can run the same firmware

Signed-off-by: Felix Fietkau <nbd@nbd.name>

package/kernel/mt76/Makefile

@@ -183,7 +183,7 @@ define Package/kmod-mt76/install
 	true
 endef
 
-define KernelPackage/mt76x2/install
+define KernelPackage/mt76x2-common/install
 	$(INSTALL_DIR) $(1)/lib/firmware
 	cp \
 		$(PKG_BUILD_DIR)/firmware/mt7662_rom_patch.bin \
@@ -191,6 +191,12 @@ define KernelPackage/mt76x2/install
 		$(1)/lib/firmware
 endef
 
+define KernelPackage/mt76x2u/install
+	$(INSTALL_DIR) $(1)/lib/firmware/mediatek
+	ln -sf ../mt7662.bin $(1)/lib/firmware/mediatek/mt7662u.bin
+	ln -sf ../mt7662_rom_patch.bin $(1)/lib/firmware/mediatek/mt7662u_rom_patch.bin
+endef
+
 define KernelPackage/mt7603/install
 	$(INSTALL_DIR) $(1)/lib/firmware
 	cp $(if $(CONFIG_TARGET_ramips_mt76x8), \