move cmd_get_data_size to command.c

add CMD_DATA_SIZE macro to enable it

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
diff --git a/include/command.h b/include/command.h
index 4a27e97..f92383d 100644
--- a/include/command.h
+++ b/include/command.h
@@ -78,6 +78,15 @@
 
 typedef	void	command_t (cmd_tbl_t *, int, int, char *[]);
 
+#if defined(CONFIG_CMD_MEMORY)		\
+    || defined(CONFIG_CMD_I2C)		\
+    || defined(CONFIG_CMD_ITEST)	\
+    || defined(CONFIG_CMD_PCI)		\
+    || defined(CONFIG_CMD_PORTIO)
+#define CMD_DATA_SIZE
+extern int cmd_get_data_size(char* arg, int default_size);
+#endif
+
 #endif	/* __ASSEMBLY__ */
 
 /*