dtt: add ds620 support

Signed-off-by: Albert ARIBAUD (3ADEV) <albert.aribaud@3adev.fr>
diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
index 25b8e8a..b4fb057 100644
--- a/drivers/hwmon/Makefile
+++ b/drivers/hwmon/Makefile
@@ -15,6 +15,7 @@
 obj-$(CONFIG_DTT_DS1621) += ds1621.o
 obj-$(CONFIG_DTT_DS1722) += ds1722.o
 obj-$(CONFIG_DTT_DS1775) += ds1775.o
+obj-$(CONFIG_DTT_DS620) += ds620.o
 obj-$(CONFIG_DTT_LM63) += lm63.o
 obj-$(CONFIG_DTT_LM73) += lm73.o
 obj-$(CONFIG_DTT_LM75) += lm75.o