arm: qemu-arm: enable RTC (PL031) by default

Virtual machine provided by qemu-arm has a ARM PL031 Real Time Clock
device. With this patch, the driver is enabled by default.

Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
Signed-off-by: Alexander Graf <agraf@suse.de>
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 0f8dd32..b39d085 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -747,6 +747,8 @@
 	select OF_CONTROL
 	select PL01X_SERIAL
 	imply CMD_DM
+	imply DM_RTC
+	imply RTC_PL031
 
 config ARCH_RMOBILE
 	bool "Renesas ARM SoCs"