[PATCH -next] ASoc: tas2770: Fix build error without GPIOLIB

[YueHaibing]

If GPIOLIB is not set, building fails:

sound/soc/codecs/tas2770.c: In function tas2770_reset:
sound/soc/codecs/tas2770.c:38:3: error: implicit declaration of function gpiod_set_value_cansleep; did you mean gpio_set_value_cansleep? [-Werror=implicit-function-declaration]
   gpiod_set_value_cansleep(tas2770->reset_gpio, 0);
   ^~~~~~~~~~~~~~~~~~~~~~~~
   gpio_set_value_cansleep
sound/soc/codecs/tas2770.c: In function tas2770_i2c_probe:
sound/soc/codecs/tas2770.c:749:24: error: implicit declaration of function devm_gpiod_get_optional; did you mean devm_regulator_get_optional? [-Werror=implicit-function-declaration]
  tas2770->reset_gpio = devm_gpiod_get_optional(tas2770->dev,
                        ^~~~~~~~~~~~~~~~~~~~~~~
                        devm_regulator_get_optional
sound/soc/codecs/tas2770.c:751:13: error: GPIOD_OUT_HIGH undeclared (first use in this function); did you mean GPIOF_INIT_HIGH?
             GPIOD_OUT_HIGH);
             ^~~~~~~~~~~~~~
             GPIOF_INIT_HIGH

Reported-by: Hulk Robot <hulkci@xxxxxxxxxx>
Fixes: 1a476abc723e ("tas2770: add tas2770 smart PA kernel driver")
Signed-off-by: YueHaibing <yuehaibing@xxxxxxxxxx>
---
 sound/soc/codecs/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/sound/soc/codecs/Kconfig b/sound/soc/codecs/Kconfig
index bcac957..d639f17 100644
--- a/sound/soc/codecs/Kconfig
+++ b/sound/soc/codecs/Kconfig
@@ -1108,6 +1108,7 @@ config SND_SOC_TAS2552
 config SND_SOC_TAS2770
 	tristate "Texas Instruments TAS2770 speaker amplifier"
 	depends on I2C
+	select GPIOLIB
 
 config SND_SOC_TAS5086
 	tristate "Texas Instruments TAS5086 speaker amplifier"
-- 
2.7.4