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Both PCH types are very different, and mixing the code for both together isn't useful. Make `ISLP` return a constant, so that IASL can fold it. Change-Id: I6222d6661115d444d4dad0217c2d376dc551465c Signed-off-by: Angel Pons <th3fanbus@gmail.com> Reviewed-on: https://review.coreboot.org/c/coreboot/+/45048 Reviewed-by: Arthur Heymans <arthur@aheymans.xyz> Tested-by: build bot (Jenkins) <no-reply@coreboot.org>