feat: Update defconfig

Author: tuxuser

configs/xbox360_defconfig

@@ -1,6 +1,6 @@
 BR2_powerpc64=y
 BR2_powerpc_970=y
-BR2_KERNEL_HEADERS_5_15=y
+BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_6_5=y
 BR2_GCC_VERSION_12_X=y
 BR2_TOOLCHAIN_BUILDROOT_CXX=y
 BR2_PACKAGE_OVERRIDE_FILE=""
@@ -13,11 +13,9 @@ BR2_LINUX_KERNEL=y
 BR2_LINUX_KERNEL_CUSTOM_GIT=y
 BR2_LINUX_KERNEL_CUSTOM_REPO_URL="https://github.com/rwf93/linux"
 BR2_LINUX_KERNEL_CUSTOM_REPO_VERSION="xenon-6.5"
-BR2_LINUX_KERNEL_USE_DEFCONFIG=y
 BR2_LINUX_KERNEL_DEFCONFIG="xenon"
 BR2_LINUX_KERNEL_IMAGE_TARGET_CUSTOM=y
 BR2_LINUX_KERNEL_IMAGE_TARGET_NAME="zImage.xenon"
-BR2_LINUX_KERNEL_IMAGE_NAME=""
 BR2_PACKAGE_BUSYBOX_SHOW_OTHERS=y
 BR2_PACKAGE_GIT=y
 BR2_PACKAGE_PCIUTILS=y