Once platform code has filled in the (legacy) ACPI PM register
map, added function will fill in the extended entries in FADT.
TEST=samsung/lumpy and amd/mandolin FADT stays unchanged.
Change-Id: I90925fce35458cf5480bfefc7cdddebd41b42058
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/74913
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Martin L Roth <gaumless@gmail.com>
