mediatek: add filogic subtarget

Initially this covers MT7986 only, but it will later be expanded to cover other
Filogic branded platforms by MediaTek

Signed-off-by: Felix Fietkau <nbd@nbd.name>
Signed-off-by: Daniel Golle <daniel@makrotopia.org>

target/linux/mediatek/image/filogic.mk

@@ -0,0 +1,51 @@
+DTS_DIR := $(DTS_DIR)/mediatek
+
+KERNEL_LOADADDR := 0x44000000
+
+define Image/Prepare
+	# For UBI we want only one extra block
+	rm -f $(KDIR)/ubi_mark
+	echo -ne '\xde\xad\xc0\xde' > $(KDIR)/ubi_mark
+endef
+
+define Device/mediatek_mt7986a-rfb
+  DEVICE_VENDOR := MediaTek
+  DEVICE_MODEL := MTK7986 rfba AP
+  DEVICE_DTS := mt7986a-rfb
+  DEVICE_DTS_DIR := $(DTS_DIR)/
+  KERNEL_LOADADDR := 0x48000000
+  DEVICE_DTS_OVERLAY := mt7986a-rfb-spim-nand mt7986a-rfb-spim-nor
+  SUPPORTED_DEVICES := mediatek,mt7986a-rfb
+  UBINIZE_OPTS := -E 5
+  BLOCKSIZE := 128k
+  PAGESIZE := 2048
+  IMAGE_SIZE := 65536k
+  KERNEL_IN_UBI := 1
+  IMAGES += factory.bin
+  IMAGE/factory.bin := append-ubi | check-size $$$$(IMAGE_SIZE)
+  IMAGE/sysupgrade.bin := sysupgrade-tar | append-metadata
+  KERNEL = kernel-bin | lzma | \
+	fit lzma $$(KDIR)/$$(firstword $$(DEVICE_DTS)).dtb
+  KERNEL_INITRAMFS = kernel-bin | lzma | \
+	fit lzma $$(KDIR)/$$(firstword $$(DEVICE_DTS)).dtb with-initrd
+  DTC_FLAGS += -@ --space 32768
+endef
+TARGET_DEVICES += mediatek_mt7986a-rfb
+
+define Device/mediatek_mt7986b-rfb
+  DEVICE_VENDOR := MediaTek
+  DEVICE_MODEL := MTK7986 rfbb AP
+  DEVICE_DTS := mt7986b-rfb
+  DEVICE_DTS_DIR := $(DTS_DIR)/
+  KERNEL_LOADADDR := 0x48000000
+  SUPPORTED_DEVICES := mediatek,mt7986b-rfb
+  UBINIZE_OPTS := -E 5
+  BLOCKSIZE := 128k
+  PAGESIZE := 2048
+  IMAGE_SIZE := 65536k
+  KERNEL_IN_UBI := 1
+  IMAGES += factory.bin
+  IMAGE/factory.bin := append-ubi | check-size $$$$(IMAGE_SIZE)
+  IMAGE/sysupgrade.bin := sysupgrade-tar | append-metadata
+endef
+TARGET_DEVICES += mediatek_mt7986b-rfb