x86: crownbay: Enable DM RTC support

Add a RTC node in the device tree to enable DM RTC support.
Signed-off-by: NBin Meng <bmeng.cn@gmail.com>
Acked-by: NSimon Glass <sjg@chromium.org>

arch/x86/dts/crownbay.dts

@@ -10,6 +10,7 @@
 
 /include/ "skeleton.dtsi"
 /include/ "serial.dtsi"
+/include/ "rtc.dtsi"
 
 / {
 	model = "Intel Crown Bay";

arch/x86/dts/rtc.dtsi

+/ {
+	rtc {
+		compatible = "motorola,mc146818";
+		reg = <0x70 2>;
+	};
+};

configs/crownbay_defconfig

@@ -18,3 +18,4 @@ CONFIG_CPU=y
 CONFIG_SPI_FLASH=y
 CONFIG_USE_PRIVATE_LIBGCC=y
 CONFIG_SYS_VSNPRINTF=y
+CONFIG_DM_RTC=y