haswell: Add ACPI support for Controllable TDP

Add ACPI Methods to enable and disable power limiting with PL1.
This can be used in ACPI Thermal Zone or in EC ACPI _QXX events.

This commit adds new unused methods and is fully tested with the
subsequent commit that makes use of these methods.

Change-Id: I9d8d23bfe9cf7c756ff8ab0412e5a010826b12db
Signed-off-by: Duncan Laurie <dlaurie@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/60546
Reviewed-on: http://review.coreboot.org/4334
Reviewed-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Tested-by: build bot (Jenkins)
1 file changed