[PATCH -next] iio: st_sensors: Fix build error

[YueHaibing]

IIO_ST_SENSORS_CORE select IIO_ST_SENSORS_I2C
unconditionally, if REGMAP_I2C is not set, build fails

drivers/iio/common/st_sensors/st_sensors_i2c.o: In function `st_sensors_i2c_configure':
st_sensors_i2c.c:(.text+0x58): undefined reference to `__devm_regmap_init_i2c'

This patch selects REGMAP_I2C to fix it.
IIO_ST_SENSORS_SPI is similar to SPI issue.

Reported-by: Hulk Robot <hulkci@xxxxxxxxxx>
Fixes: 062809ef7733 ("iio: make st_sensors drivers use regmap")
Signed-off-by: YueHaibing <yuehaibing@xxxxxxxxxx>
---
 drivers/iio/common/st_sensors/Kconfig | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/iio/common/st_sensors/Kconfig b/drivers/iio/common/st_sensors/Kconfig
index 91b98e1..16d973f 100644
--- a/drivers/iio/common/st_sensors/Kconfig
+++ b/drivers/iio/common/st_sensors/Kconfig
@@ -5,8 +5,10 @@
 
 config IIO_ST_SENSORS_I2C
 	tristate
+	select REGMAP_I2C
 
 config IIO_ST_SENSORS_SPI
+	select REGMAP_SPI
 	tristate
 
 config IIO_ST_SENSORS_CORE
-- 
2.7.4