ASoC: codecs: wcd937x: make stub functions inline

ASoC: codecs: wcd937x: make stub functions inline

For some reason we ended up with stub functions that are not inline,
this can result in build error if its included multiple places, as we will
be redefining the same function

Fixes: c99a515ff153 ("ASoC: codecs: wcd937x-sdw: add SoundWire driver")
Cc: Stable@vger.kernel.org
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@oss.qualcomm.com>
Link: https://patch.msgid.link/20250909121954.225833-3-srinivas.kandagatla@oss.qualcomm.com
Signed-off-by: Mark Brown <broonie@kernel.org>