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/cpci5200/cpci5200.c b/board/esd/cpci5200/cpci5200.c
index 6eedb83..b6b50fb 100644
--- a/board/esd/cpci5200/cpci5200.c
+++ b/board/esd/cpci5200/cpci5200.c
@@ -294,5 +294,5 @@
 }
 
 U_BOOT_CMD(writepci, 3, 1, do_writepci,
-	   "writepci- Write some data to pcibus\n",
+	   "Write some data to pcibus",
 	   "<addr> <size>\n" "        - Write some data to pcibus.\n");