ASoC: dmic: add regulator support

ASoC: dmic: add regulator support

[Sven Grewe]

Dear Maintainers,

I tested linux-next and a patch in it breaks the audio and delays the 
shutdown process on my system for a few minutes. Reverting the following 
patch seems to fix it for me in linux-next 20250314:

Author: Olivier Moysan <olivier.moysan@foss.st.com>
Date:   Thu Mar 6 18:18:40 2025 +0100

     ASoC: dmic: add regulator support

     Allow management of the regulator that may be used to supply the
     digital microphone.

     Signed-off-by: Olivier Moysan <olivier.moysan@foss.st.com>
     Link: 
https://patch.msgid.link/20250306171840.593443-3-olivier.moysan@foss.st.com
     Signed-off-by: Mark Brown <broonie@kernel.org>



linux-next 20250307 worked. Later versions had the problem I described 
above.

For the bisection I used the default .config from Debian's 6.12.x kernel 
when building. I build and ran them on my Samsung Galaxy Book. This 
device got a patch recently in linux-next not related to audio. That's 
why I wanted to test linux-next and found this.
Linux version 
6.14.0-rc6-next-20250314-next20250314-revertbrooniesound-grewe 
(sven@Turbine) (gcc (Debian 14.2.0-17) 14.2.0, GNU ld (GNU Binutils for 
Debian) 2.44) #1 SMP PREEMPT_DYNAMIC Sun Mar 16 16:06:58 CET 2025
Operating System: Debian GNU/Linux trixie on x86_64
Audio Chip: Realtek ALC256

Kind regards,
Sven J. Grewe