superio/ite/it8720f: Implement power control

Program the Super I/O to turn the machine on or restore its power state
when AC power is restored.

Based on code from src/superio/nuvoton/nct5572d/superio.c.

Change-Id: I1f3432f43b0784c3696bf1d7233b83d3a203af20
Signed-off-by: Samuel Holland <samuel@sholland.org>
Reviewed-on: https://review.coreboot.org/25463
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
1 file changed