Update acpigen_write_alib_dptc() to support "low/no battery mode",
which throttles the SOC when there is no battery connected or the
battery charge is critically low.
This is in preparation for enabling this functionality for Mendocino.
BUG=b:217911928
TEST=Build zork
TEST=Boot nipperkin
TEST=Boot skyrim
Signed-off-by: Tim Van Patten <timvp@google.com>
Change-Id: Icea10a3876a29744ad8485be1557e184bcbfa397
Reviewed-on: https://review.coreboot.org/c/coreboot/+/66804
Reviewed-by: Raul Rangel <rrangel@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>