ARM: omap2plus_defconfig: enable twl4030_madc as a loadable module

The ADC is used by twl4030_charger to read voltages. If a dtb contains
the ADC but the module is not build, probing twl4030_charger will be
endlessly deferred, so just enable CONFIG_TWL4030_MADC in the config.
Signed-off-by: Andreas Kemnade <andreas@kemnade.info>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/configs/omap2plus_defconfig

@@ -510,6 +510,7 @@ CONFIG_IIO_ST_ACCEL_3AXIS=m
 CONFIG_CPCAP_ADC=m
 CONFIG_INA2XX_ADC=m
 CONFIG_TI_AM335X_ADC=m
+CONFIG_TWL4030_MADC=m
 CONFIG_SENSORS_ISL29028=m
 CONFIG_BMP280=m
 CONFIG_PWM=y