fix grub keyboard init on dell e6400 and e6430

also, enable seabios_withgrub on e6400, but not grubfirst;
right now, we also support dgpu which would brick on
grubfirst. on my tested nvidia model, loading grub from
seabios worked, so i'm going to re-add seabios_grubfirst
functionality like in older libreboot revisions, enabled
selectively on a given target.

e6430 currently only has igpu support anyway, but i've done
the same thing there, in anticipation of future dgpu support.

e6400 and e6430 ec report scancode set 2 with translation
by default, but only actually output scancode set 1

grub is trying to use scancode set 2 without scancode
translation, so the key inputs get messed up

fix it by forcing scancode set 2 with translation, but
only on coreboot; other build targets on GRUB will
retain the same behaviour as before

courtesy goes to Nicholas Chin who inspired me, and
helped me to fix this. tested on Nicholas's E6400
and E6430, and my E6400; Riku also tested it on
non-Dell, as did I (some thinkpads), and all seems OK.

The new behaviour in coreboot GRUB is essentially no
different to that of SeaBIOS, which does the same.

Signed-off-by: Leah Rowe <leah@libreboot.org>

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