x86 desktops: only enable seabios_withgrub

and only where grub was already enabled; on boards
that did not enable grub, grub is still disabled

on desktops, it's possible that the user may insert
a graphics card. if their first payload was grub,
it won't work because lbmk doesn't configure coreboot
itself to execute vga roms at present

i found when testing t1650 (dell) that if a vgarom is
loaded from seabios (from a graphics card), the grub
payload still works; if booting in corebootfb mode,
text mode is still used when booting with the card

to decrease the probability of bricks with any given
set of users, make seabios the only payload that starts
first, but make grub available in the esc menu on seabios

it's possible to add a bootorder file and disable the
seabios menu, if you only want a grub payload accessible

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

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