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/P2041RDB.h b/include/configs/P2041RDB.h
index 74008f6..bc0172b 100644
--- a/include/configs/P2041RDB.h
+++ b/include/configs/P2041RDB.h
@@ -509,14 +509,14 @@
 	"fdtfile=p2041rdb/p2041rdb.dtb\0"			\
 	"bdev=sda3\0"
 
-#define CONFIG_HDBOOT					\
+#define HDBOOT					\
 	"setenv bootargs root=/dev/$bdev rw "		\
 	"console=$consoledev,$baudrate $othbootargs;"	\
 	"tftp $loadaddr $bootfile;"			\
 	"tftp $fdtaddr $fdtfile;"			\
 	"bootm $loadaddr - $fdtaddr"
 
-#define CONFIG_NFSBOOTCOMMAND			\
+#define NFSBOOTCOMMAND			\
 	"setenv bootargs root=/dev/nfs rw "	\
 	"nfsroot=$serverip:$rootpath "		\
 	"ip=$ipaddr:$serverip:$gatewayip:$netmask:$hostname:$netdev:off " \
@@ -525,7 +525,7 @@
 	"tftp $fdtaddr $fdtfile;"		\
 	"bootm $loadaddr - $fdtaddr"
 
-#define CONFIG_RAMBOOTCOMMAND				\
+#define RAMBOOTCOMMAND				\
 	"setenv bootargs root=/dev/ram rw "		\
 	"console=$consoledev,$baudrate $othbootargs;"	\
 	"tftp $ramdiskaddr $ramdiskfile;"		\
@@ -533,7 +533,7 @@
 	"tftp $fdtaddr $fdtfile;"			\
 	"bootm $loadaddr $ramdiskaddr $fdtaddr"
 
-#define CONFIG_BOOTCOMMAND		CONFIG_HDBOOT
+#define CONFIG_BOOTCOMMAND		HDBOOT
 
 #include <asm/fsl_secure_boot.h>