fix compilation problem for mpc8349itx CFG_RAMBOOT

Current include/configs/MPC8349ITX.h does contain some support for building
image that will be started from memory (without putting in into flash).
It could be triggered by building with TEXT_BASE set to a low value.

However, this support is incomplete: using of low TEXT_BASE causes
defining configuration macros in inconsistent way, which later leads
to compilation errors. In particular. flash support is being disabled,
but then flash structures get referenced.

This patch fixes this, making it possible to build with low TEXT_BASE.

Signed-Off-By: Nikita Youshchenko <yoush@debian.org>

Signed-off-by: Kim Phillips <kim.phillips@freescale.com>

include/configs/MPC8349ITX.h

@@ -409,6 +409,7 @@ boards, we say we have two, but don't display a message if we find only one. */
   #define CFG_ENV_SIZE		0x2000
 #else
   #define CFG_NO_FLASH		/* Flash is not usable now */
+  #undef  CFG_FLASH_CFI_DRIVER
   #define CFG_ENV_IS_NOWHERE	/* Store ENV in memory only */
   #define CFG_ENV_ADDR		(CFG_MONITOR_BASE - 0x1000)
   #define CFG_ENV_SIZE		0x2000
@@ -437,7 +438,14 @@ boards, we say we have two, but don't display a message if we find only one. */
 #define CONFIG_COMMANDS_I2C	0
 #endif
 
-#define CONFIG_COMMANDS		(CONFIG_CMD_DFL | \
+#ifdef CFG_NO_FLASH
+#define CONFIG_COMMANDS_DEFAULT (CONFIG_CMD_DFL & ~(CFG_CMD_FLASH | \
+						    CFG_CMD_IMLS))
+#else
+#define CONFIG_COMMANDS_DEFAULT CONFIG_CMD_DFL
+#endif
+
+#define CONFIG_COMMANDS		(CONFIG_COMMANDS_DEFAULT | \
 				CONFIG_COMMANDS_CF	| \
 				CFG_CMD_NET	| \
 				CFG_CMD_PING	| \