[coreboot] LAR TODO

[Myles Watson]

>  >> Myles? Could you prepare a patch which #ifdefs the code instead of
>  >> removing it?

This patch is a hopefully less controversial version of a previous patch which
removed the ELF loader from coreboot v3.  This adds a Kconfig option
PAYLOAD_ELF_LOADER which builds the loader into v3.  In order to make it a
little safer, I changed PAYLOAD_PREPARSE_ELF to PAYLOAD_NO_PREPARSE_ELF and
made that option depend on PAYLOAD_ELF_LOADER so that no one adds an unparsed
ELF without the loader.

One part that was strange to me was that I first tried adding elfboot.o and
archelfboot.o to the beginning of the list of object files.  This broke
coreboot.  It still finished building, but would not boot on QEMU.  I was
surprised that it broke it, but didn't investigate further.

Myles

Signed-off-by: Myles Watson <mylesgw at gmail.com>
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