iio: adc: ad7380: select REGMAP

iio: adc: ad7380: select REGMAP

The AD7380 driver uses generic regmap types and APIs. However, its
Kconfig entry does not select REGMAP.

As a result, AD7380 can be enabled from an allnoconfig-derived config
with SPI_MASTER=y while REGMAP remains unset, causing ad7380.o to fail
to build.

Fixes: b095217c104b ("iio: adc: ad7380: new driver for AD7380 ADCs")
Signed-off-by: Samuel Moelius <samuel.moelius@trailofbits.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@intel.com>
Reviewed-by: Nuno Sá <nuno.sa@analog.com>
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>