[configs/releng] Add UEFI boot support via Linux >= 3.3 EFI boot stub on x86_64

Makes an efiboot.img (FAT16) for "El Torito" (additional).
Under an EFI-system, implies that this .ISO works only if is used
as "CD-ROM/DVD-ROM" not in ISO-HYBRID-MBR mode.
If you want, an EFI-ready USB-key, just unpack this "<ISO>/EFI/efiboot.img" (FAT16) to
"<USB-key-FAT-formatted>/EFI" then copy "<ISO>/arch" and setup the filesystem label.

An aditional EFI shell is provided with an startup script for automatic booting
until EFI_STUB supports "linux.conf" to pass boot parms to kernel.
Anyway I think that is a good idea to keep this shell, so can customize boot parms,
or for doing other tasks on systems without an EFI-shell.

RFCv1: Initial efiboot.img build with vmlinuz.efi (Linux with EFI_STUB enabled)
       and archiso.img (initramfs).
RFCv2: Use an startup.nsh with EFI-Shell 2.0 (generated from build.sh) for automatic boot.
RFCv3: Use and older EFI-Shell 1.0 instead of 2.0, since not all UEFI-systems
       are compatible with 2.3+ specs.
RFCv4: The script "startup.nsh" improved by Keshav P R, using a for-loop
       (see notes below from original commit), now that has more than 1-line,
       I moved it to an independent file and is parsed by build.sh.

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About startup.nsh:
Author: Keshav P R <the.ridikulus.rat@gmail.com>
Date:   Thu Apr 5 10:33:20 2012 +0530
    [configs/releng] Search in all existing UEFI FS mountpoints for archiso efistub kernel file

    There is no guarantee that the efistub kernel will always be in fs0:
    (similar to the case inside linux OS where the sda, sdb confusion exists,
    hence the need for UUIDs), especially when USB (instead os CD/ISO) is
    used for booting.

    Hence loop through all possible fs mountpoints (in UEFI) in startup.nsh
    and try to launch the first mountpoint that contains the archiso files.

    Cd's into the fs%m:\EFI\archiso directory also may remove future issues
    with efistub's linux.conf where the efistub might have problems
    identifying the directory from which the kernel was launched.

    Also add an helpful echo message showing the user the UEFI PATH to the
    archiso kernel file being launched by startup.nsh .

    Hopefully this should work in both CD and USB. Tested in Tianocore
    UDK/EDK2 DuetPkg X64 UEFI 2.3.1 firmware with EdkShellBinPkg's Shell.
----

Signed-off-by: Gerardo Exequiel Pozzi <vmlinuz386@yahoo.com.ar>

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