ASoC: ops: Update mask generation to use GENMASK

ASoC: ops: Update mask generation to use GENMASK

Use GENMASK to make the masks for the various control helper functions.
Also factor out a shared helper function for the volsw and volsw_range
controls since the same code is appropriate for each. Note this does add
support for sign_bit into the volsw_range callbacks.

Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Link: https://patch.msgid.link/20250318171459.3203730-5-ckeepax@opensource.cirrus.com
Signed-off-by: Mark Brown <broonie@kernel.org>