Command usage cleanup

Remove command name from all command "usage" fields and update
common/command.c to display "name - usage" instead of
just "usage". Also remove newlines from command usage fields.

Signed-off-by: Peter Tyser <ptyser@xes-inc.com>
diff --git a/include/command.h b/include/command.h
index 58992e9..d7321af 100644
--- a/include/command.h
+++ b/include/command.h
@@ -33,6 +33,11 @@
 #define NULL	0
 #endif
 
+/* Default to a width of 8 characters for help message command width */
+#ifndef CONFIG_SYS_HELP_CMD_WIDTH
+#define CONFIG_SYS_HELP_CMD_WIDTH	8
+#endif
+
 #ifndef	__ASSEMBLY__
 /*
  * Monitor Command Table