arm64: dts: qcom: msm8916/39: Cleanup audio pinctrl

The audio pinctrl in MSM8916/MSM8939 is very similar but still has
subtle differences, e.g. &cdc_pdm_lines_act on MSM8916 vs
&cdc_pdm_lines_default on MSM8939.

Make this consistent and use the chance to cleanup all of the audio
pinctrl: Drop unneeded outer nodes and replace the names taken over
from the vendor kernel with more clear ones that are similar to the
actual pinctrl function.

Cc: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Signed-off-by: Stephan Gerhold <stephan@gerhold.net>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230529-msm8916-pinctrl-v1-4-11f540b51c93@gerhold.net