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/ls2088ardb_tfa_SECURE_BOOT_defconfig b/configs/ls2088ardb_tfa_SECURE_BOOT_defconfig
index 3ac0330..1dd7c1d 100644
--- a/configs/ls2088ardb_tfa_SECURE_BOOT_defconfig
+++ b/configs/ls2088ardb_tfa_SECURE_BOOT_defconfig
@@ -98,6 +98,7 @@
 CONFIG_PCI=y
 CONFIG_PCIE_LAYERSCAPE_RC=y
 CONFIG_DM_RTC=y
+CONFIG_RTC_DS3231=y
 CONFIG_DM_SCSI=y
 CONFIG_CONS_INDEX=2
 CONFIG_SYS_NS16550_SERIAL=y