ppc: Rework some hard-coded BOOTCOMMANDS

There are an assortment of hard-coded CONFIG_BOOTCOMMAND options in some
board headers.  Rework these so that they do not add to the CONFIG
namespace.

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/include/configs/ge_bx50v3.h b/include/configs/ge_bx50v3.h
index 5be3a49..8570b92 100644
--- a/include/configs/ge_bx50v3.h
+++ b/include/configs/ge_bx50v3.h
@@ -53,7 +53,7 @@
                 "nfs ${loadaddr} /srv/nfs/fitImage; " \
                 "bootm ${loadaddr}\0" \
 
-#define CONFIG_NETWORKBOOTCOMMAND \
+#define NETWORKBOOTCOMMAND \
 	"run networkboot; " \
 
 #else
@@ -108,14 +108,14 @@
 		"run doboot; " \
 		"run failbootcmd\0" \
 
-#define CONFIG_MMCBOOTCOMMAND \
+#define MMCBOOTCOMMAND \
 	"run doquiet; " \
 	"run tryboot; " \
 
 #ifdef CONFIG_CMD_NFS
-#define CONFIG_BOOTCOMMAND CONFIG_NETWORKBOOTCOMMAND
+#define CONFIG_BOOTCOMMAND NETWORKBOOTCOMMAND
 #else
-#define CONFIG_BOOTCOMMAND CONFIG_MMCBOOTCOMMAND
+#define CONFIG_BOOTCOMMAND MMCBOOTCOMMAND
 #endif