rtc: Clean drivers/rtc/Makefile

Signed-off-by: Michal Simek <monstr@monstr.eu>
diff --git a/drivers/rtc/ds164x.c b/drivers/rtc/ds164x.c
index 5943f87..c621a9e 100644
--- a/drivers/rtc/ds164x.c
+++ b/drivers/rtc/ds164x.c
@@ -37,7 +37,7 @@
 #include <rtc.h>
 
 
-#if defined(CONFIG_RTC_DS164x) && defined(CONFIG_CMD_DATE)
+#if defined(CONFIG_CMD_DATE)
 
 static uchar    rtc_read(unsigned int addr );
 static void     rtc_write(unsigned int addr, uchar val);