cpu/ rtc/ include/: Remove lingering references to CFG_CMD_* symbols.

Signed-off-by: Jon Loeliger <jdl@freescale.com>
diff --git a/rtc/ds174x.c b/rtc/ds174x.c
index e3028e2..5f85a68 100644
--- a/rtc/ds174x.c
+++ b/rtc/ds174x.c
@@ -199,4 +199,4 @@
 	return (((n / 10) << 4) | (n % 10));
 }
 
-#endif	/* CONFIG_RTC_MC146818 && CFG_CMD_DATE */
+#endif