iio: adc: rzg2l_adc: Use devres helpers to request pre-deasserted reset controls

Starting with commit d872bed8 ("reset: Add devres helpers to request
pre-deasserted reset controls"), devres helpers are available to simplify
the process of requesting pre-deasserted reset controls. Update the
rzg2l_adc driver to utilize these helpers, reducing complexity in this
way.

Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
Reviewed-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Link: https://patch.msgid.link/20241206111337.726244-4-claudiu.beznea.uj@bp.renesas.com


Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>