fixme/hack: override dt name for edge kernel only

config/boards/rock-5b-plus.conf

@@ -31,6 +31,9 @@ function post_family_tweaks__rock5b_naming_audios() {
 function post_family_config_branch_edge__rock-5b_use_mainline_uboot() {
 	display_alert "$BOARD" "mainline (next branch) u-boot overrides for $BOARD / $BRANCH" "info"
 
+	# temporary override until DT in armbian/rockchip-linux is renamed
+	declare -g BOOT_FDT_FILE="rockchip/rk3588-rock-5b-plus.dtb"
+
 	declare -g BOOTCONFIG="rock5b-rk3588_defconfig"                       # override the default for the board/family
 	declare -g BOOTDELAY=1                                                # Wait for UART interrupt to enter UMS/RockUSB mode etc
 	declare -g BOOTSOURCE="https://github.com/u-boot/u-boot.git"          # We ❤️ Mainline tree