rtc: rv3029: add to Kconfig

The MicroCrystal RV3029 driver didn't have a Kconfig entry and was not used
anywhere. Add it to Kconfig to make it selectable.

Signed-off-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Tested-by: Klaus Goger <klaus.goger@theobroma-systems.com>
diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index bcc01b1..6038b43 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -60,6 +60,16 @@
 	  This driver supports reading and writing the RTC/calendar and detects
 	  total power failures.
 
+config RTC_RV3029
+	bool "Enable RV3029 driver"
+	depends on DM_RTC
+	help
+	  The MicroCrystal RV3029 is a I2C Real Time Clock (RTC) with 8-byte
+	  battery-backed SRAM.
+
+	  This driver supports reading and writing the RTC/calendar and the
+	  battery-baced SRAM section.
+
 config RTC_RX8010SJ
 	bool "Enable RX8010SJ driver"
 	depends on DM_RTC