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/esd/common/cmd_loadpci.c b/board/esd/common/cmd_loadpci.c
index ad490c3..0a6626e 100644
--- a/board/esd/common/cmd_loadpci.c
+++ b/board/esd/common/cmd_loadpci.c
@@ -123,7 +123,7 @@
 
 U_BOOT_CMD(
 	loadpci,	1,	1,	do_loadpci,
-	"loadpci - Wait for pci bootcmd and boot it\n",
+	"Wait for pci bootcmd and boot it",
 	NULL
 	);