ALSA: ac97: kconfig: Remove select of undefined symbol AC97

The AC97_BUS_NEW Kconfig symbol selects the globally undefined symbol
AC97.

Robert Jarzmik confirmed in https://lkml.org/lkml/2018/2/7/96 that the
select was put in by mistake and can be safely removed, with no other
changes required. Remove it.

Fixes: 74426fbff6 ("ALSA: ac97: add an ac97 bus")
Signed-off-by: Ulf Magnusson <ulfalizer@gmail.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/ac97/Kconfig

@@ -5,7 +5,6 @@
 
 config AC97_BUS_NEW
 	tristate
-	select AC97
 	help
 	  This is the new AC97 bus type, successor of AC97_BUS. The ported
 	  drivers which benefit from the AC97 automatic probing should "select"