ASoC: codecs: wcd-clsh: Remove the unused function

The function wcd_clsh_set_buck_mode() is defined in the wcd-clsh-v2.c
file, but not called elsewhere, so remove this unused function.

sound/soc/codecs/wcd-clsh-v2.c:133:20: warning: unused function 'wcd_clsh_enable_status'.

Link: https://bugzilla.openanolis.cn/show_bug.cgi?id=3348
Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Signed-off-by: Jiapeng Chong <jiapeng.chong@linux.alibaba.com>
Link: https://lore.kernel.org/r/20221205073507.36071-1-jiapeng.chong@linux.alibaba.com
Signed-off-by: Mark Brown <broonie@kernel.org>