regmap: provide regmap_assign_bits()

Add another bits helper to regmap API: this one sets given bits if value
is true and clears them if it's false.

Suggested-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Link: https://patch.msgid.link/20241108-assign-bits-v1-1-382790562d99@ideasonboard.com


Signed-off-by: Mark Brown <broonie@kernel.org>