ASoC: sti-sas: Constify snd_soc_component_driver struct

ASoC: sti-sas: Constify snd_soc_component_driver struct

In order to constify `snd_soc_component_driver` struct, simplify the logic
and the `sti_sas_dev_data` struct.

Since commit 165a57a3df02 ("ASoC: sti-sas: clean legacy in sti-sas") only
only chip is supported and `sti_sas_driver` can be fully defined at
compilation time.

Before:
======
   text	   data	    bss	    dec	    hex	filename
   8033	   1547	     16	   9596	   257c	sound/soc/codecs/sti-sas.o

After:
=====
   text	   data	    bss	    dec	    hex	filename
   8257	   1163	     16	   9436	   24dc	sound/soc/codecs/sti-sas.o

Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Link: https://patch.msgid.link/2c08558813e3bbfae0a5302199cf6ca226e7cde1.1722544073.git.christophe.jaillet@wanadoo.fr
Signed-off-by: Mark Brown <broonie@kernel.org>