power: supply: Add new Intel Dollar Cove TI battery driver

Intel has 2 completely different "Dollar Cove" PMICs for its Bay Trail /
Cherry Trail SoCs. One is made by X-Powers and is called the AXP288.

The AXP288's builtin charger and fuel-gauge functions are already
supported by the axp288_charger / axp288_fuel_gauge drivers.

The other "Dollar Cove" PMIC is made by TI and does not have any clear TI
denomination, its MFD driver calls it the "Intel Dollar Cove TI PMIC".

The Intel Dollar Cove TI PMIC comes with a coulomb-counters with limited
functionality which is intended to work together with an always on
micro-controller monitoring it for fuel-gauge functionality.

Most devices with the Dollar Cove TI PMIC have full-featured fuel-gauge
functionality exposed through ACPI with the information coming from either
the embedded-controller or a separate full-featured fuel-gauge IC.

But some designs lack this, add a battery-monitoring driver using the
PMIC's coulomb-counter combined with the adc-battery-helper for capacity
estimation for these designs.

Register definitions were taken from kernel/drivers/platform/x86/dc_ti_cc.c
from the Acer A1-840 Android kernel source-code archive named:
"App. Guide_Acer_20151221_A_A.zip"
which is distributed by Acer from the Acer A1-840 support page:
https://www.acer.com/us-en/support/product-support/A1-840/downloads

Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Hans de Goede <hansg@kernel.org>
Link: https://lore.kernel.org/r/20250831122942.47875-6-hansg@kernel.org
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>

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