fixup! macaudio: Fix missing kconfig requirement

Author: jannau

sound/soc/apple/Kconfig

@@ -18,7 +18,7 @@ config SND_SOC_APPLE_MACAUDIO
 	select SND_SOC_TAS2770 if I2C
 	select SND_SOC_CS42L83 if I2C
 	select SND_SOC_CS42L84 if I2C
-	select REGULATOR_FIXED_VOLTAGE
+	select REGULATOR_FIXED_VOLTAGE if REGULATOR
 	default ARCH_APPLE
 	help
 	  This option enables an ASoC machine-level driver for Apple Silicon Macs