ASoC: fix unmet dependency on GPIOLIB for SND_SOC_MAX98357A

When SND_SOC_INTEL_KBL_DA7219_MAX98357A_MACH is selected,
and GPIOLIB is not selected, Kbuild gives the
following warnings:

WARNING: unmet direct dependencies detected for SND_SOC_MAX98357A
  Depends on [n]: SOUND [=y] && !UML && SND [=y] && SND_SOC [=y] && GPIOLIB [=n]
  Selected by [y]:
  - SND_SOC_INTEL_DA7219_MAX98357A_GENERIC [=y] && SOUND [=y] && !UML && SND [=y] && SND_SOC [=y] && SND_SOC_INTEL_MACH [=y]

WARNING: unmet direct dependencies detected for SND_SOC_DMIC
  Depends on [n]: SOUND [=y] && !UML && SND [=y] && SND_SOC [=y] && GPIOLIB [=n]
  Selected by [y]:
  - SND_SOC_INTEL_DA7219_MAX98357A_GENERIC [=y] && SOUND [=y] && !UML && SND [=y] && SND_SOC [=y] && SND_SOC_INTEL_MACH [=y]

WARNING: unmet direct dependencies detected for SND_SOC_INTEL_DA7219_MAX98357A_GENERIC
  Depends on [n]: SOUND [=y] && !UML && SND [=y] && SND_SOC [=y] && SND_SOC_INTEL_MACH [=y] && GPIOLIB [=n]
  Selected by [y]:
  - SND_SOC_INTEL_KBL_DA7219_MAX98357A_MACH [=y] && SOUND [=y] && !UML && SND [=y] && SND_SOC [=y] && SND_SOC_INTEL_MACH [=y] && SND_SOC_INTEL_KBL [=y] && I2C [=y] && ACPI [=y] && (MFD_INTEL_LPSS [=y] || COMPILE_TEST [=n])

This is because SND_SOC_DMIC and SND_SOC_MAX98357A are
selected by SND_SOC_INTEL_DA7219_MAX98357A_GENERIC, which
is also selected by SND_SOC_INTEL_KBL_DA7219_MAX98357A_MACH.
However, the selectors do not depend on or select GPIOLIB,
despite SND_SOC_DMIC and SND_SOC_MAX98357A depending on GPIOLIB.

These unmet dependency bugs were detected by Kismet,
a static analysis tool for Kconfig. Please advise if this
is not the appropriate solution.
Signed-off-by: Julian Braha <julianbraha@gmail.com>
Link: https://lore.kernel.org/r/20211025010615.10070-1-julianbraha@gmail.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/intel/boards/Kconfig

@@ -371,7 +371,7 @@ config SND_SOC_INTEL_KBL_RT5663_RT5514_MAX98927_MACH
 
 config SND_SOC_INTEL_KBL_DA7219_MAX98357A_MACH
 	tristate "KBL with DA7219 and MAX98357A in I2S Mode"
-	depends on I2C && ACPI
+	depends on I2C && ACPI && GPIOLIB
 	depends on MFD_INTEL_LPSS || COMPILE_TEST
 	select SND_SOC_INTEL_DA7219_MAX98357A_GENERIC
 	help