rtc: move RTC_RX8025 to Kconfig

move RTC_RX8025 to Kconfig and fixup board configs.

Signed-off-by: Heiko Schocher <hs@denx.de>
diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index 0b58a18..860b73d 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -86,6 +86,11 @@
 	help
 	  Support for Epson RX8010SJ Real Time Clock devices.
 
+config RTC_RX8025
+	bool "Enable RX8025 driver"
+	help
+	  Support for Epson RX8025 Real Time Clock devices.
+
 config RTC_PL031
 	bool "Enable ARM AMBA PL031 RTC driver"
 	help