roms: remind the user about gkb files

nowadays, we don't insert GRUB keymaps automatically, for
sake of efficiency; without one, the default is US QWERTY.

a user will only want one keymap in particular, so this
is more efficient. in practise, they're either building
from source anyway, or using the inject scripts which
compile cbfstool anyway, so the user will already have
cbfstool.

also output this message from the inject script.

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

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