ASoc: tas2770: Fix build error without GPIOLIB

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@huawei.com>
Fixes: 1a476abc ("tas2770: add tas2770 smart PA kernel driver")
Suggested-by: Ladislav Michl <ladis@linux-mips.org>
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Link: https://lore.kernel.org/r/20191006104631.60608-1-yuehaibing@huawei.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/tas2770.c

@@ -15,6 +15,7 @@
 #include <linux/pm.h>
 #include <linux/i2c.h>
 #include <linux/gpio.h>
+#include <linux/gpio/consumer.h>
 #include <linux/pm_runtime.h>
 #include <linux/regulator/consumer.h>
 #include <linux/firmware.h>