arm64: defconfig: Enable RZG2L_ADC

Enable ADC driver support for Renesas RZ/G2L based platforms.
Signed-off-by: NLad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Link: https://lore.kernel.org/r/20210927193551.22422-1-prabhakar.mahadev-lad.rj@bp.renesas.comSigned-off-by: NGeert Uytterhoeven <geert+renesas@glider.be>

arch/arm64/configs/defconfig

@@ -1078,6 +1078,7 @@ CONFIG_MAX9611=m
 CONFIG_QCOM_SPMI_VADC=m
 CONFIG_QCOM_SPMI_ADC5=m
 CONFIG_ROCKCHIP_SARADC=m
+CONFIG_RZG2L_ADC=m
 CONFIG_IIO_CROS_EC_SENSORS_CORE=m
 CONFIG_IIO_CROS_EC_SENSORS=m
 CONFIG_IIO_ST_LSM6DSX=m