regulator: axp20x: AXP717: dcdc4 doesn't have delay

According to AXP717 user manual, DCDC4 doesn't have a ramp delay like
DCDC1/2/3 do.

Remove it from the description and cleanup the macros.

Signed-off-by: Philippe Simons <simons.philippe@gmail.com>
Acked-by: Chen-Yu Tsai <wens@csie.org>
Reviewed-by: Andre Przywara <andre.przywara@arm.com>
Link: https://patch.msgid.link/20250318205147.42850-1-simons.philippe@gmail.com


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