regulator: rk808: add #include for gpiod functions

This fixes a build problem on mips found by the kbuild test robot:

drivers/regulator/rk808-regulator.c: In function 'rk808_buck1_2_get_voltage_sel_regmap':
drivers/regulator/rk808-regulator.c:97:2: error: implicit declaration of function 'gpiod_get_value' [-Werror=implicit-function-declaration]
if (IS_ERR(gpio) || gpiod_get_value(gpio) == 0)
^

Fixes: bad47ad2eef3 ("regulator: rk808: fixed the overshoot when adjust voltage")
Signed-off-by: Uwe Kleine-König <[e-mail]>
Signed-off-by: Mark Brown <[e-mail]>

drivers/regulator/rk808-regulator.c

···
 #include <linux/mfd/rk808.h>
 #include <linux/regulator/driver.h>
 #include <linux/regulator/of_regulator.h>
+#include <linux/gpio/consumer.h>
 
 /* Field Definitions */
 #define RK808_BUCK_VSEL_MASK	0x3f