ASoC: simple-amplifier: Remove spurious gpiolib select

The usage of GPIOs is optional in the code so don't force on gpiolib when
building it, avoiding warnings in randconfigs.

Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20220202192333.3655269-4-broonie@kernel.org
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/Kconfig

@@ -1391,7 +1391,6 @@ config SND_SOC_SIGMADSP_REGMAP
 
 config SND_SOC_SIMPLE_AMPLIFIER
 	tristate "Simple Audio Amplifier"
-	select GPIOLIB
 
 config SND_SOC_SIMPLE_MUX
 	tristate "Simple Audio Mux"