x86: remove grub-legacy

Config.in

package/grub/Makefile

package/grub/patches/002-strip_note_gnu_build_id.patch

package/grub/patches/010-fixes-1.patch

package/grub/patches/020-ext4_support.patch

package/grub/patches/030-add-stage2-ldscripts.patch

package/grub/patches/040-automake-compat.patch

package/grub/patches/100-add_configure_macros.patch

package/grub/patches/110-remove_configure_errors.patch

package/grub/patches/200-darwin_fixes.patch

package/grub/patches/210-remove_inline_asm.patch

target/linux/x86/image/Config.in

target/linux/x86/image/Makefile

target/linux/x86/image/gen_image_grub.sh

target/linux/x86/image/menu.lst