rtc: Clean drivers/rtc/Makefile

Signed-off-by: Michal Simek <monstr@monstr.eu>
diff --git a/drivers/rtc/ds3231.c b/drivers/rtc/ds3231.c
index 95cb186..d8cd47d 100644
--- a/drivers/rtc/ds3231.c
+++ b/drivers/rtc/ds3231.c
@@ -33,7 +33,7 @@
 #include <rtc.h>
 #include <i2c.h>
 
-#if defined(CONFIG_RTC_DS3231) && defined(CONFIG_CMD_DATE)
+#if defined(CONFIG_CMD_DATE)
 
 /*---------------------------------------------------------------------*/
 #undef DEBUG_RTC