rtc: Clean drivers/rtc/Makefile

Signed-off-by: Michal Simek <monstr@monstr.eu>
diff --git a/drivers/rtc/max6900.c b/drivers/rtc/max6900.c
index e9979f2..4cfc5de 100644
--- a/drivers/rtc/max6900.c
+++ b/drivers/rtc/max6900.c
@@ -32,7 +32,7 @@
 #include <rtc.h>
 #include <i2c.h>
 
-#if defined(CONFIG_RTC_MAX6900) && defined(CONFIG_CMD_DATE)
+#if defined(CONFIG_CMD_DATE)
 
 #ifndef	CFG_I2C_RTC_ADDR
 #define	CFG_I2C_RTC_ADDR	0x50