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: 28b4c30b ("iio: amplifiers: ada4250: add support for ADA4250")
Signed-off-by: Javier Carrasco <javier.carrasco.cruz@gmail.com>
Link: https://patch.msgid.link/20241003-ad2s1210-select-v1-5-4019453f8c33@gmail.com
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

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