cpu/[7a-ln-z]*: Remove obsolete references to CONFIG_COMMANDS

Signed-off-by: Jon Loeliger <jdl@freescale.com>
diff --git a/cpu/ppc4xx/serial.c b/cpu/ppc4xx/serial.c
index 67c8a8b..aefa4ca 100644
--- a/cpu/ppc4xx/serial.c
+++ b/cpu/ppc4xx/serial.c
@@ -843,7 +843,7 @@
 
 #endif	/* CONFIG_SERIAL_SOFTWARE_FIFO */
 
-#if (CONFIG_COMMANDS & CFG_CMD_KGDB) || defined(CONFIG_CMD_KGDB)
+#if defined(CONFIG_CMD_KGDB)
 /*
   AS HARNOIS : according to CONFIG_KGDB_SER_INDEX kgdb uses serial port
   number 0 or number 1