ASoC: simple-mux: Depend on gpiolib rather than selecting it

The simple-mux driver requires gpiolib. Currently it selects GPIOLIB but
since the use of select can lead to issues with randconfig let's instead
depend on GPIOLIB, select is more idiomatically used for Kconfig symbols
that are not user selectable but GPIOLIB is user selectable.
Signed-off-by: NMark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20220202192333.3655269-7-broonie@kernel.orgSigned-off-by: NMark Brown <broonie@kernel.org>

sound/soc/codecs/Kconfig

@@ -1394,7 +1394,7 @@ config SND_SOC_SIMPLE_AMPLIFIER
 
 config SND_SOC_SIMPLE_MUX
 	tristate "Simple Audio Mux"
-	select GPIOLIB
+	depends on GPIOLIB
 
 config SND_SOC_SPDIF
 	tristate "S/PDIF CODEC"