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/board/bf537-stamp/cmd_bf537led.c b/board/bf537-stamp/cmd_bf537led.c
index fa650f2..e77bb0c 100644
--- a/board/bf537-stamp/cmd_bf537led.c
+++ b/board/bf537-stamp/cmd_bf537led.c
@@ -196,6 +196,6 @@
 
 /* Register information for u-boot to find this command */
 U_BOOT_CMD(led, 3, 1, do_bf537led,
-	   "led- Control BF537 stamp LEDs\n", USAGE_LONG);
+	   "Control BF537 stamp LEDs", USAGE_LONG);
 
 #endif