mediatek: make TUF-AX4200 KERNEL simply expanded

The KERNEL variable was recursively expanded, breaking other devices.

Signed-off-by: David Bauer <[email protected]>

target/linux/mediatek/image/filogic.mk

@@ -47,7 +47,7 @@ define Device/asus_tuf-ax4200
   DEVICE_PACKAGES := kmod-usb3 kmod-mt7986-firmware mt7986-wo-firmware
   IMAGES := sysupgrade.bin
   KERNEL_LOADADDR := 0x48000000
-  KERNEL = kernel-bin | lzma | \
+  KERNEL := kernel-bin | lzma | \
 	fit lzma $$(KDIR)/image-$$(firstword $$(DEVICE_DTS)).dtb
   KERNEL_INITRAMFS := kernel-bin | lzma | \
 	fit lzma $$(KDIR)/image-$$(firstword $$(DEVICE_DTS)).dtb with-initrd | pad-to 64k