'cx2072x_eq_ctrl' has been unused since the original
commit a497a436 ("ASoC: Add support for Conexant CX2072X CODEC").

Remove it.
Signed-off-by: Dr. David Alan Gilbert <linux@treblig.org>
Link: https://msgid.link/r/20240601225446.183505-4-linux@treblig.orgSigned-off-by: Mark Brown <broonie@kernel.org>