configs: khadas-vim3: enable ADC device support

Analog to Digital Converter device (Meson SARADC) will be used for
probing 'Function' button state.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
[narmstrong: also updated khadas-vim3l_defconfig]
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
diff --git a/configs/khadas-vim3_defconfig b/configs/khadas-vim3_defconfig
index 9d7ba72..5d16652 100644
--- a/configs/khadas-vim3_defconfig
+++ b/configs/khadas-vim3_defconfig
@@ -29,6 +29,8 @@
 CONFIG_OF_CONTROL=y
 CONFIG_SYS_RELOC_GD_ENV_ADDR=y
 CONFIG_NET_RANDOM_ETHADDR=y
+CONFIG_ADC=y
+CONFIG_SARADC_MESON=y
 CONFIG_DM_I2C=y
 CONFIG_SYS_I2C_MESON=y
 CONFIG_DM_MMC=y
diff --git a/configs/khadas-vim3l_defconfig b/configs/khadas-vim3l_defconfig
index f37993e..6b13ce0 100644
--- a/configs/khadas-vim3l_defconfig
+++ b/configs/khadas-vim3l_defconfig
@@ -29,6 +29,8 @@
 CONFIG_OF_CONTROL=y
 CONFIG_SYS_RELOC_GD_ENV_ADDR=y
 CONFIG_NET_RANDOM_ETHADDR=y
+CONFIG_ADC=y
+CONFIG_SARADC_MESON=y
 CONFIG_DM_I2C=y
 CONFIG_SYS_I2C_MESON=y
 CONFIG_DM_MMC=y