drm/msm/dp: unregister audio driver during unbind

drm/msm/dp: unregister audio driver during unbind

while binding the code always registers a audio driver, however there
is no corresponding unregistration done in unbind. This leads to multiple
redundant audio platform devices if dp_display_bind and dp_display_unbind
happens multiple times during startup. On X13s platform this resulted in
6 to 9 audio codec device instead of just 3 codec devices for 3 dp ports.

Fix this by unregistering codecs on unbind.

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Fixes: d13e36d7d222 ("drm/msm/dp: add audio support for Display Port on MSM")
Reviewed-by: Abhinav Kumar <quic_abhinavk@quicinc.com>
Patchwork: https://patchwork.freedesktop.org/patch/533324/
Link: https://lore.kernel.org/r/20230421145657.12186-1-srinivas.kandagatla@linaro.org
Signed-off-by: Abhinav Kumar <quic_abhinavk@quicinc.com>