ramips: define loadaddr for all UniFi devices

Define the load-address for the DTB of all Ubiquiti UniFi devices using
FIT images. From the GPL code we can assume these boards are affected by
the same relocating issue with the vendor bootloader.

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

target/linux/ramips/image/mt7621.mk

@@ -2064,6 +2064,7 @@ define Device/ubnt_unifi-flexhd
   DEVICE_VENDOR := Ubiquiti
   DEVICE_MODEL := UniFi FlexHD
   DEVICE_DTS_CONFIG := config@2
+  DEVICE_DTS_LOADADDR := 0x87000000
   KERNEL := kernel-bin | lzma | fit lzma $$(KDIR)/image-$$(firstword $$(DEVICE_DTS)).dtb
   DEVICE_PACKAGES += kmod-mt7603 kmod-mt7615e kmod-mt7615-firmware kmod-leds-ubnt-ledbar
   IMAGE_SIZE := 15552k
@@ -2084,6 +2085,7 @@ define Device/ubnt_usw-flex
   DEVICE_VENDOR := Ubiquiti
   DEVICE_MODEL := UniFi Switch Flex
   DEVICE_DTS_CONFIG := config@1
+  DEVICE_DTS_LOADADDR := 0x87000000
   KERNEL := kernel-bin | lzma | fit lzma $$(KDIR)/image-$$(firstword $$(DEVICE_DTS)).dtb
   IMAGE_SIZE := 7360k
 endef