vpl: Add Kconfig options for VPL

Add VPL versions of commonly used Kconfig options.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index 7a6c6ef..2396327 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -32,6 +32,15 @@
 	  drivers to perform the actual functions. See rtc.h for a
 	  description of the API.
 
+config VPL_DM_RTC
+	bool "Enable Driver Model for RTC drivers in VPL"
+	depends on VPL_DM
+	help
+	  Enable drver model for real-time-clock drivers. The RTC uclass
+	  then provides the rtc_get()/rtc_set() interface, delegating to
+	  drivers to perform the actual functions. See rtc.h for a
+	  description of the API.
+
 config RTC_ENABLE_32KHZ_OUTPUT
 	bool "Enable RTC 32Khz output"
 	help