arm: atmel: at91sam9x5: move CONFIG_SYS_NO_FLASH to proper position

In config_cmd_default.h, it will use CONFIG_SYS_NO_FLASH to decide
whether include CONFIG_CMD_FLASH and CONFIG_CMD_IMLS. So, move the
CONFIG_SYS_NO_FLASH to proper position, then we don't need to undef
these two commands.

Signed-off-by: Bo Shen <voice.shen@atmel.com>
Signed-off-by: Andreas Bießmann <andreas.devel@googlemail.com>

include/configs/at91sam9x5ek.h

@@ -61,14 +61,15 @@
 #define CONFIG_BOOTP_GATEWAY
 #define CONFIG_BOOTP_HOSTNAME
 
+/* no NOR flash */
+#define CONFIG_SYS_NO_FLASH
+
 /*
  * Command line configuration.
  */
 #include <config_cmd_default.h>
 #undef CONFIG_CMD_FPGA
 #undef CONFIG_CMD_IMI
-#undef CONFIG_CMD_IMLS
-#undef CONFIG_CMD_LOADS
 
 #define CONFIG_CMD_PING
 #define CONFIG_CMD_DHCP
@@ -100,9 +101,6 @@
 #define CONFIG_SF_DEFAULT_SPEED		30000000
 #endif
 
-/* no NOR flash */
-#define CONFIG_SYS_NO_FLASH
-
 /* NAND flash */
 #ifdef CONFIG_CMD_NAND
 #define CONFIG_NAND_ATMEL