regmap: Simplify devres handling

regmap: Simplify devres handling

The resource-managed devm_regmap_init() can be a bit simpler by using
devm_add_action_or_reset() instead of devres_alloc().  This allows to
drop the less-obvious pointer to pointer (struct regmap **ptr) and make
devm_regmap_release() interface simpler.

Code is functionally equivalent with minor difference: devres_alloc()
will happen now after successful resource init (__regmap_init()).

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
Link: https://patch.msgid.link/20260305201349.32734-2-krzysztof.kozlowski@oss.qualcomm.com
Signed-off-by: Mark Brown <broonie@kernel.org>