rtc: driver for Goldfish RTC

The Goldfish RTC is a virtual device which may be supplied by QEMU.
It is enabled by default on QEMU's RISC-V virt machine.

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index 2317313..7fc53a6 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -122,6 +122,13 @@
 	  CONFIG_BOOTP_NTPSERVER. The RTC time is advanced according to CPU
 	  ticks.
 
+config RTC_GOLDFISH
+	bool "Enable Goldfish driver"
+	depends on DM_RTC
+	help
+	  The Goldfish RTC is a virtual device which may be supplied by QEMU.
+	  It is enabled by default on QEMU's RISC-V virt machine.
+
 config RTC_ISL1208
 	bool "Enable ISL1208 driver"
 	depends on DM_RTC