MAILBOXES_DESKTOP is unused, and the IGD opregion spec makes no
distinction in the mailboxes supported between desktop and mobile
platforms. Rename MAILBOXES_MOBILE to IGD_MAILBOXES for consistency
with other mailbox variables and clean up the comment.
Change-Id: Ia06fe75702887aa6953bf17bd4bc14af4038bec5
Signed-off-by: Matt DeVillier <matt.devillier@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/86279
Reviewed-by: Jérémy Compostella <jeremy.compostella@intel.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
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