regulator: lp872x: Remove platform_data based probing

The platform_data-based probing is tightly integrated into the lp872x
driver structure itself; removing just the platform data support is
impossible without remodeling major parts of the probe sequence.

The lp872x_platform_data structure was removed, and its contents were
incorporated into the driver private structure and lp872x_chip_info (which
holds differences between the LP8720 and LP8725). The
lp872x_populate_pdata_from_dt() helper was removed: general Device Tree
parsing code was integrated directly into the probe function, and
DVS-related code was consolidated into lp872x_init_dvs().
lp872x_hw_enable() and lp872x_config() helpers were folded into probe().
i2c_client_get_device_id() was switched to i2c_get_match_data(). Finally,
of_regulator_match structures were dropped, and
lp872x_regulator_register() was upgraded to rely on the core regulator
registration framework.

Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
Link: https://patch.msgid.link/20261013181417.492252-6-clamor95@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>

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