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/pci405/cmd_pci405.c b/board/esd/pci405/cmd_pci405.c
index f558a2b..a0d1f3f 100644
--- a/board/esd/pci405/cmd_pci405.c
+++ b/board/esd/pci405/cmd_pci405.c
@@ -108,7 +108,7 @@
 }
 U_BOOT_CMD(
 	loadpci,	1,	1,	do_loadpci,
-	"loadpci - Wait for pci-image and boot it\n",
+	"Wait for pci-image and boot it",
 	NULL
 );
 #endif