ASoC: ops: Replace snd_soc_read_signed() with new helper

The current snd_soc_read_signed() helper is only used from
snd_soc_get_volsw() and can be implemented more simply with
sign_extend. Remove snd_soc_read_signed() and add a new
soc_mixer_reg_to_ctl() helper. This new helper does not
include the reading of the register, but does include min and
max handling. This allows the helper to replace more of the
duplicated code and makes it easier to process the differences
between single, double register and double shift style controls.

It is worth noting this adds support for sign_bit into the _range
and sx callbacks and the invert option to sx callbacks.

Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Link: https://patch.msgid.link/20250318171459.3203730-7-ckeepax@opensource.cirrus.com
Signed-off-by: Mark Brown <broonie@kernel.org>

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