Use acpigen_write_processor_cnot to implement notifications to the CPU.
Change-Id: If482c64e7133cc6d82472d121ac138fc1b60a183
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/c/29892
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Duncan Laurie <dlaurie@chromium.org>
Reviewed-by: David Guckian