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

Signed-off-by: Jon Loeliger <jdl@freescale.com>
diff --git a/cpu/ppc4xx/kgdb.S b/cpu/ppc4xx/kgdb.S
index cd12727..8c4bbf2 100644
--- a/cpu/ppc4xx/kgdb.S
+++ b/cpu/ppc4xx/kgdb.S
@@ -75,4 +75,4 @@
 	SYNC
 	blr
 
-#endif /* CFG_CMD_KGDB */
+#endif