arm64: defconfig: Enable RPi voltage sensor

The patch enables the hwmon driver for the Raspberry Pi.

Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
Signed-off-by: Eric Anholt <eric@anholt.net>
Reviewed-by: Eric Anholt <eric@anholt.net>
diff --git a/arch/arm64/configs/defconfig b/arch/arm64/configs/defconfig
index 3cfa8ca..2823566 100644
--- a/arch/arm64/configs/defconfig
+++ b/arch/arm64/configs/defconfig
@@ -365,6 +365,7 @@
 CONFIG_SENSORS_ARM_SCPI=y
 CONFIG_SENSORS_LM90=m
 CONFIG_SENSORS_INA2XX=m
+CONFIG_SENSORS_RASPBERRYPI_HWMON=m
 CONFIG_THERMAL_GOV_POWER_ALLOCATOR=y
 CONFIG_CPU_THERMAL=y
 CONFIG_THERMAL_EMULATION=y