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_fdt.c b/common/cmd_fdt.c
index a36ca20..0947b72 100644
--- a/common/cmd_fdt.c
+++ b/common/cmd_fdt.c
@@ -819,7 +819,7 @@
 
 U_BOOT_CMD(
 	fdt,	255,	0,	do_fdt,
-	"fdt     - flattened device tree utility commands\n",
+	"flattened device tree utility commands",
 	    "addr   <addr> [<length>]        - Set the fdt location to <addr>\n"
 #ifdef CONFIG_OF_BOARD_SETUP
 	"fdt boardsetup                      - Do board-specific set up\n"