iio: adc: exynos: describe drivers in KConfig

Describe better which driver applies to which SoC, to make configuring
kernel for Samsung SoC easier.
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Link: https://lore.kernel.org/r/20210924133515.112357-1-krzysztof.kozlowski@canonical.comSigned-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/iio/adc/Kconfig

@@ -430,9 +430,9 @@ config EXYNOS_ADC
 	depends on ARCH_EXYNOS || ARCH_S3C24XX || ARCH_S3C64XX || ARCH_S5PV210 || (OF && COMPILE_TEST)
 	depends on HAS_IOMEM
 	help
-	  Core support for the ADC block found in the Samsung EXYNOS series
-	  of SoCs for drivers such as the touchscreen and hwmon to use to share
-	  this resource.
+	  Driver for the ADC block found in the Samsung S3C (S3C2410, S3C2416,
+	  S3C2440, S3C2443, S3C6410), S5Pv210 and Exynos SoCs.
+	  Choose Y here only if you build for such Samsung SoC.
 
 	  To compile this driver as a module, choose M here: the module will be
 	  called exynos_adc.