ASoC: codecs: wcd939x: get regmap directly

ASoC: codecs: wcd939x: get regmap directly

for some reason we ended up with a boiler plate for dev_get_regmap in
wcd939x codec and started exporting a symbol for this. Remove this
redundant wrapper and direclty get regmap.

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@oss.qualcomm.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Link: https://patch.msgid.link/20250909121954.225833-11-srinivas.kandagatla@oss.qualcomm.com
Signed-off-by: Mark Brown <broonie@kernel.org>