ASoC: cs4271: Convert to GPIO descriptors

This converts the Cirrus CS4271 ASoC codec driver to use
GPIO descriptors.

It turns out that there are two in-kernel users of the platform
data passing mechanism so these are switched over as well.

One locally defined GPIO "gpio_disabled" is declared in the
state struct but completely unused in the driver, so we delete
it.

Reviewed-by: Alexander Sverdlin <[email protected]>
Acked-by: Charles Keepax <[email protected]>
Signed-off-by: Linus Walleij <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>

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