imx93_evk: defconfig: add adc support

iMX93 ADC features:
    - 4 channels
    - 12 bit resolution

Signed-off-by: Luca Ellero <l.ellero@asem.it>
diff --git a/configs/imx93_11x11_evk_defconfig b/configs/imx93_11x11_evk_defconfig
index 0de563f..65f4738 100644
--- a/configs/imx93_11x11_evk_defconfig
+++ b/configs/imx93_11x11_evk_defconfig
@@ -81,6 +81,7 @@
 CONFIG_SPL_DM=y
 CONFIG_REGMAP=y
 CONFIG_SYSCON=y
+CONFIG_ADC_IMX93=y
 CONFIG_CPU=y
 CONFIG_CPU_IMX=y
 CONFIG_IMX_RGPIO2P=y