mx6sabre_common: Use the default CONFIG_SYS_PBSIZE

Entering the maximum number of characters defined by CONFIG_SYS_CBSIZE into
the console and hitting enter afterwards, causes a hang in the system because
CONFIG_SYS_PBSIZE is not capable of storing the characters of the error message:
"Unknown command '' - try 'help'".

Use the default CONFIG_SYS_PBSIZE definition from config_fallbacks.h to solve
this problem.

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>

include/configs/mx6sabre_common.h

@@ -220,9 +220,6 @@
 #define CONFIG_SYS_PROMPT_HUSH_PS2     "> "
 #define CONFIG_AUTO_COMPLETE
 #define CONFIG_SYS_CBSIZE              256
-
-/* Print Buffer Size */
-#define CONFIG_SYS_PBSIZE (CONFIG_SYS_CBSIZE + sizeof(CONFIG_SYS_PROMPT) + 16)
 #define CONFIG_SYS_MAXARGS             16
 #define CONFIG_SYS_BARGSIZE CONFIG_SYS_CBSIZE