regulator: rtq2208: Switch back to use struct i2c_driver's .probe()

struct i2c_driver::probe_new is about to go away. Switch the driver to
use the probe callback with the same prototype.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Link: https://lore.kernel.org/r/20230814210759.26395-1-u.kleine-koenig@pengutronix.de
Signed-off-by: Mark Brown <broonie@kernel.org>

regulator: rtq2208: Add Richtek RTQ2208 SubPMIC driver

Add support for the RTQ2208 SubPMIC
This ic integrates with configurable, synchrnous buck converters and two ldos.

Signed-off-by: Alina Yu <alina_yu@richtek.com>
Link: https://lore.kernel.org/r/1691389687-31211-3-git-send-email-alina_yu@richtek.com
Signed-off-by: Mark Brown <broonie@kernel.org>