ASoC: cs35l41: Support external boost

Add support for external boost voltage, where GPIO1 must control a
switch to isolate CS35L41 from the external Boost Voltage

Signed-off-by: Lucas Tanure <tanureal@opensource.cirrus.com>
Acked-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Acked-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20220413083728.10730-17-tanureal@opensource.cirrus.com


Signed-off-by: Takashi Iwai <tiwai@suse.de>