ec/lenovo/h8: Implement ACPI methods to set battery thresholds

There are two known (yet) different ways to manage battery thresholds.
This patch implements them and adds a way to enable them for
different mainboards.

Tested on W530 with 4.18.3-gentoo kernel. Works fine with new
Linux userspace API for controlling battery thresholds, available since
4.17.
(/sys/class/power_supply/BAT0/charge_(start|stop)_threshold).

The new API is supported by TLP (you might need to set NATACPI_ENABLE=1
in /etc/tlp.conf).

tpacpi-bat works fine too.

Signed-off-by: Alexey Kharlamov <der@2-47.ru>
Signed-off-by: Evgeny Zinoviev <me@ch1p.com>

Change-Id: I2a90f9e9b32462b8a5e9bc8d3087ae0fea563ea5
---
M src/ec/lenovo/h8/Kconfig
M src/ec/lenovo/h8/acpi/thinkpad.asl
A src/ec/lenovo/h8/acpi/thinkpad_bat_thresholds.asl
A src/ec/lenovo/h8/acpi/thinkpad_bat_thresholds_24.asl
A src/ec/lenovo/h8/acpi/thinkpad_bat_thresholds_b0.asl
M src/mainboard/lenovo/t400/Kconfig
M src/mainboard/lenovo/t400/acpi/ec.asl
M src/mainboard/lenovo/t420/Kconfig
M src/mainboard/lenovo/t420/acpi/ec.asl
M src/mainboard/lenovo/t420s/Kconfig
M src/mainboard/lenovo/t420s/acpi/ec.asl
M src/mainboard/lenovo/t430/Kconfig
M src/mainboard/lenovo/t430/acpi/ec.asl
M src/mainboard/lenovo/t430s/Kconfig
M src/mainboard/lenovo/t430s/acpi/ec.asl
M src/mainboard/lenovo/t520/Kconfig
M src/mainboard/lenovo/t520/acpi/ec.asl
M src/mainboard/lenovo/t530/Kconfig
M src/mainboard/lenovo/t530/acpi/ec.asl
M src/mainboard/lenovo/x1_carbon_gen1/Kconfig
M src/mainboard/lenovo/x1_carbon_gen1/acpi/ec.asl
M src/mainboard/lenovo/x200/Kconfig
M src/mainboard/lenovo/x200/acpi/ec.asl
M src/mainboard/lenovo/x201/Kconfig
M src/mainboard/lenovo/x201/acpi/ec.asl
M src/mainboard/lenovo/x220/Kconfig
M src/mainboard/lenovo/x220/acpi/ec.asl
M src/mainboard/lenovo/x230/Kconfig
M src/mainboard/lenovo/x230/acpi/ec.asl
29 files changed, 461 insertions(+), 0 deletions(-)