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/common/cmd_console.c b/common/cmd_console.c
index e2bc2a3..f861f83 100644
--- a/common/cmd_console.c
+++ b/common/cmd_console.c
@@ -65,6 +65,6 @@
 
 U_BOOT_CMD(
 	coninfo,	3,	1,	do_coninfo,
-	"coninfo - print console devices and information\n",
+	"print console devices and information",
 	""
 );