configs/roseapplepi: remove defconfig, broken

The roseapplepi defconfig fails to build u-boot since the move to GCC 15.x:

https://gitlab.com/buildroot.org/buildroot/-/jobs/11501385206

The issues are mainly related to missing includes, but given that the build
has been broken for a while, there is no mainline u-boot support for the
platform and the minimal kernel support has not seen any updates since it
was added for v5.15, just drop the defconfig.

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
(cherry picked from commit 56091a5818)
Signed-off-by: Thomas Perale <thomas.perale@mind.be>

configs/roseapplepi_defconfig

@@ -1,35 +0,0 @@
-BR2_arm=y
-BR2_cortex_a9=y
-BR2_ARM_ENABLE_NEON=y
-BR2_ARM_ENABLE_VFP=y
-BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_5_15=y
-BR2_GLOBAL_PATCH_DIR="board/roseapplepi/patches"
-BR2_SYSTEM_DHCP="eth0"
-BR2_ROOTFS_POST_BUILD_SCRIPT="board/roseapplepi/post-build.sh"
-BR2_ROOTFS_POST_IMAGE_SCRIPT="support/scripts/genimage.sh"
-BR2_ROOTFS_POST_SCRIPT_ARGS="-c board/roseapplepi/genimage.cfg"
-BR2_LINUX_KERNEL=y
-BR2_LINUX_KERNEL_CUSTOM_VERSION=y
-BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="5.15.14"
-BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG=y
-BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE="board/roseapplepi/linux.config"
-BR2_LINUX_KERNEL_UIMAGE=y
-BR2_LINUX_KERNEL_UIMAGE_LOADADDR="0x8000"
-BR2_LINUX_KERNEL_DTS_SUPPORT=y
-BR2_LINUX_KERNEL_INTREE_DTS_NAME="owl-s500-roseapplepi"
-BR2_TARGET_ROOTFS_EXT2=y
-BR2_TARGET_ROOTFS_EXT2_4=y
-# BR2_TARGET_ROOTFS_TAR is not set
-BR2_TARGET_S500_BOOTLOADER=y
-BR2_TARGET_S500_BOOTLOADER_BOARD="linux/bubble_gum_sd"
-BR2_TARGET_UBOOT=y
-BR2_TARGET_UBOOT_BUILD_SYSTEM_KCONFIG=y
-BR2_TARGET_UBOOT_CUSTOM_GIT=y
-BR2_TARGET_UBOOT_CUSTOM_REPO_URL="https://github.com/xapp-le/u-boot.git"
-BR2_TARGET_UBOOT_CUSTOM_REPO_VERSION="a035d2673a90143a1a74557503b2e137b1447ae6"
-BR2_TARGET_UBOOT_BOARD_DEFCONFIG="actduino_bubble_gum_v10"
-BR2_TARGET_UBOOT_NEEDS_DTC=y
-BR2_TARGET_UBOOT_FORMAT_DTB_IMG=y
-BR2_PACKAGE_HOST_DOSFSTOOLS=y
-BR2_PACKAGE_HOST_GENIMAGE=y
-BR2_PACKAGE_HOST_MTOOLS=y