sys-boot/grub-efi-image: add initial work

sys-boot/grub-efi-image/files/grub-efi-modules

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+all_video
+boot
+btrfs
+cat
+chain
+configfile
+echo
+efifwsetup
+efinet
+ext2
+fat
+font
+f2fs
+gettext
+gfxmenu
+gfxterm
+gfxterm_background
+gzio
+halt
+help
+hfsplus
+iso9660
+jfs
+jpeg
+keystatus
+loadenv
+loopback
+linux
+ls
+lsefi
+lsefimmap
+lsefisystab
+lssal
+memdisk
+minicmd
+normal
+ntfs
+part_apple
+part_msdos
+part_gpt
+password_pbkdf2
+png
+probe
+reboot
+regexp
+search
+search_fs_uuid
+search_fs_file
+search_label
+serial
+sleep
+smbios
+squash4
+tar
+test
+true
+video
+xfs
+zfs
+zfscrypt
+zfsinfo
+cpuid
+play
+tpm
+cryptodisk
+gcry_arcfour
+gcry_blowfish
+gcry_camellia
+gcry_cast5
+gcry_crc
+gcry_des
+gcry_dsa
+gcry_idea
+gcry_md4
+gcry_md5
+gcry_rfc2268
+gcry_rijndael
+gcry_rmd160
+gcry_rsa
+gcry_seed
+gcry_serpent
+gcry_sha1
+gcry_sha256
+gcry_sha512
+gcry_tiger
+gcry_twofish
+gcry_whirlpool
+luks
+lvm
+mdraid09
+mdraid1x
+raid5rec
+raid6rec