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_portio.c b/common/cmd_portio.c
index b318ff0..41b1991 100644
--- a/common/cmd_portio.c
+++ b/common/cmd_portio.c
@@ -93,7 +93,7 @@
 
 U_BOOT_CMD(
 	out,	3,	1,	do_portio_out,
-	"out     - write datum to IO port\n",
+	"write datum to IO port",
 	"[.b, .w, .l] port value\n    - output to IO port\n"
 );
 
@@ -157,7 +157,7 @@
 
 U_BOOT_CMD(
 	in,	2,	1,	do_portio_in,
-	"in      - read data from an IO port\n",
+	"read data from an IO port",
 	"[.b, .w, .l] port\n"
 	"    - read datum from IO port\n"
 );