khadas-edge2: remove legacy uboot (armbian#9367)

Agreed during maintainer meeting

Author: efectn

config/boards/khadas-edge2.conf

@@ -28,27 +28,8 @@ function post_family_tweaks__kedge2_naming_audios() {
 	return 0
 }
 
-# for the kedge2, we're counting on the blobs+u-boot in SPI working, as it comes from factory. It does not support bootscripts.
-function post_family_config__uboot_kedge2() {
-	if [[ $BRANCH == "edge" || $BRANCH == "current" ]]; then
-		return
-	fi
-
-	display_alert "$BOARD" "Configuring ($BOARD) u-boot" "info"
-
-	declare -g BOOTSOURCE='https://github.com/khadas/u-boot.git'
-	declare -g BOOTBRANCH="commit:df276095a29a02f8e7ce4f451770c06486106594"
-	declare -g BOOTPATCHDIR="legacy/u-boot-khadas-edge2-rk3588"
-	declare -g BOOTCONFIG="khadas-edge2-rk3588s_defconfig"
-	declare -g SRC_EXTLINUX="yes" # For now, use extlinux. Thanks Monka
-}
-
-# Mainline U-Boot for current kernel
+# Mainline U-Boot
 function post_family_config__kedge2_use_mainline_uboot() {
-	if [[ $BRANCH == "vendor" ]]; then
-		return
-	fi
-
 	display_alert "$BOARD" "Mainline U-Boot overrides for $BOARD - $BRANCH" "info"
 
 	declare -g BOOTCONFIG="khadas-edge2-rk3588s_defconfig"