Convert CONFIG_RTC_DS1337 et al to Kconfig

This converts the following to Kconfig:
   CONFIG_RTC_DS1337
   CONFIG_RTC_DS1337_NOOSC
   CONFIG_RTC_DS1338
   CONFIG_RTC_DS1374
   CONFIG_RTC_DS3231
   CONFIG_RTC_MC13XXX
   CONFIG_RTC_MXS
   CONFIG_RTC_PT7C4338

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/work_92105_defconfig b/configs/work_92105_defconfig
index 127bbf7..167a078 100644
--- a/configs/work_92105_defconfig
+++ b/configs/work_92105_defconfig
@@ -72,6 +72,7 @@
 CONFIG_PHYLIB=y
 CONFIG_PHY_ADDR_ENABLE=y
 CONFIG_PHY_SMSC=y
+CONFIG_RTC_DS1374=y
 CONFIG_SPECIFY_CONSOLE_INDEX=y
 CONFIG_CONS_INDEX=5
 CONFIG_SYS_NS16550=y