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

Signed-off-by: Jon Loeliger <jdl@freescale.com>
diff --git a/cpu/mpc8xx/kgdb.S b/cpu/mpc8xx/kgdb.S
index d4c77e7..812baa3 100644
--- a/cpu/mpc8xx/kgdb.S
+++ b/cpu/mpc8xx/kgdb.S
@@ -71,4 +71,4 @@
 	SYNC
 	blr
 
-#endif /* CFG_CMD_KGDB */
+#endif