Prepare for common ACPI code. Make acpi_fill_fadt() match
intel/commom/block/acpi/acpi.c function. Use soc_acpi_fill_fadt()
to set cpx fadt->flags.
Change-Id: I9c04dd478aa5e0f1467e63d06da094128edd9650
Signed-off-by: Marc Jones <marcjones@sysproconsulting.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/45845
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Reviewed-by: Jay Talbott <JayTalbott@sysproconsulting.com>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>