staging:iio:mxs-lradc: Select STMP_DEVICE

The MXS ADC driver uses the stmp_reset_block() which is only provided when the
STMP_DEVICE Kconfig symbol is selected. Hence the driver should select this
symbol. So far this has not been a problem since the driver depends on ARCH_MXS,
which already selects STMP_DEVICE, but will become necessary once we allow the
driver to be built when COMPILE_TEST is selected.
Signed-off-by: NLars-Peter Clausen <lars@metafoo.de>
Cc: Marek Vasut <marex@denx.de>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

drivers/staging/iio/adc/Kconfig

@@ -114,6 +114,7 @@ config LPC32XX_ADC
 config MXS_LRADC
 	tristate "Freescale i.MX23/i.MX28 LRADC"
 	depends on ARCH_MXS
+	select STMP_DEVICE
 	select IIO_BUFFER
 	select IIO_TRIGGERED_BUFFER
 	help