zephyr:skyrim: Resolve guybrush test build issue
zephyr:skyrim: Resolve guybrush test build issue

Guybrush was never updated to include interrupt defines needed
for MKBP.  Adding these settings on Skyrim caused the guybrush
test build to fail.

BUG=b:232988616
BRANCH=NONE
TEST=zmake build guybrush

Signed-off-by: Jon Murphy <ef000d5e2b938b44ac60c709bf9862f8d0f6bdc2@google.com>

Change-Id: Ie749ea6bc32f00ebd7de76025483e9a56a2425ff
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/3652228
Reviewed-by: Reka Norman <38fbfaf57e7283feb1d814df4ef2373eca256f2b@chromium.org>
Commit-Queue: Reka Norman <38fbfaf57e7283feb1d814df4ef2373eca256f2b@chromium.org>
Auto-Submit: Jonathon Murphy <ef000d5e2b938b44ac60c709bf9862f8d0f6bdc2@google.com>
Tested-by: Jonathon Murphy <ef000d5e2b938b44ac60c709bf9862f8d0f6bdc2@google.com>

coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec