iio: amplifiers: ada4250: add missing select REGMAP_SPI in Kconfig

This driver makes use of regmap_spi, but does not select the required
module.
Add the missing 'select REGMAP_SPI'.

Fixes: 28b4c30 ("iio: amplifiers: ada4250: add support for ADA4250")
Signed-off-by: Javier Carrasco <[email protected]>
Link: https://patch.msgid.link/[email protected]
Cc: <[email protected]>
Signed-off-by: Jonathan Cameron <[email protected]>

Author: javiercarrascocruz

drivers/iio/amplifiers/Kconfig

@@ -27,6 +27,7 @@ config AD8366
 config ADA4250
 	tristate "Analog Devices ADA4250 Instrumentation Amplifier"
 	depends on SPI
+	select REGMAP_SPI
 	help
 	  Say yes here to build support for Analog Devices ADA4250
 	  SPI Amplifier's support. The driver provides direct access via