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/configs/caddy2_defconfig b/configs/caddy2_defconfig
index 33253b1..51c37e2 100644
--- a/configs/caddy2_defconfig
+++ b/configs/caddy2_defconfig
@@ -111,6 +111,7 @@
 CONFIG_FLASH_CFI_DRIVER=y
 CONFIG_SYS_FLASH_CFI=y
 CONFIG_E1000=y
+CONFIG_RTC_RX8025=y
 CONFIG_BAUDRATE=9600
 CONFIG_SYS_NS16550=y
 CONFIG_OF_LIBFDT=y