ASoC: doc: Update dead links

The alsa-project documentation is now part of the kernel docs,
the original links are long dead, update links.
Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Mark Brown <broonie@kernel.org>
Cc: Takashi Iwai <tiwai@suse.de>
Link: https://lore.kernel.org/r/20220628165807.152191-1-marex@denx.deSigned-off-by: Mark Brown <broonie@kernel.org>

Documentation/process/kernel-docs.rst

@@ -108,7 +108,7 @@ On-line docs
     * Title: **Writing an ALSA Driver**
 
       :Author: Takashi Iwai <tiwai@suse.de>
-      :URL: http://www.alsa-project.org/~iwai/writing-an-alsa-driver/index.html
+      :URL: https://www.kernel.org/doc/html/latest/sound/kernel-api/writing-an-alsa-driver.html
       :Date: 2005
       :Keywords: ALSA, sound, soundcard, driver, lowlevel, hardware.
       :Description: Advanced Linux Sound Architecture for developers,

Documentation/sound/soc/codec.rst

@@ -132,7 +132,7 @@ The codec driver also supports the following ALSA PCM operations:-
   };
 
 Please refer to the ALSA driver PCM documentation for details.
-http://www.alsa-project.org/~iwai/writing-an-alsa-driver/
+https://www.kernel.org/doc/html/latest/sound/kernel-api/writing-an-alsa-driver.html
 
 
 DAPM description

Documentation/sound/soc/platform.rst

@@ -46,7 +46,7 @@ snd_soc_component_driver:-
   };
 
 Please refer to the ALSA driver documentation for details of audio DMA.
-http://www.alsa-project.org/~iwai/writing-an-alsa-driver/
+https://www.kernel.org/doc/html/latest/sound/kernel-api/writing-an-alsa-driver.html
 
 An example DMA driver is soc/pxa/pxa2xx-pcm.c
 

sound/pci/ens1370.c

@@ -8,7 +8,7 @@
 /* Power-Management-Code ( CONFIG_PM )
  * for ens1371 only ( FIXME )
  * derived from cs4281.c, atiixp.c and via82xx.c
- * using http://www.alsa-project.org/~tiwai/writing-an-alsa-driver/ 
+ * using https://www.kernel.org/doc/html/latest/sound/kernel-api/writing-an-alsa-driver.html
  * by Kurt J. Bosch
  */