The AXP717 also contains an adjustable boost regulator, to provide the
5V USB VBUS rail when running on battery.

Add the regulator description that states the voltage range this
regulator can cover.
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Reviewed-by: John Watts <contact@jookia.org>
Reviewed-by: Chen-Yu Tsai <wens@csie.org>
Link: https://patch.msgid.link/20240816001824.6028-4-andre.przywara@arm.comSigned-off-by: Mark Brown <broonie@kernel.org>