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_fdos.c b/common/cmd_fdos.c
index 514c049..bcf98d9 100644
--- a/common/cmd_fdos.c
+++ b/common/cmd_fdos.c
@@ -142,12 +142,12 @@
 
 U_BOOT_CMD(
 	fdosboot,	3,	0,	do_fdosboot,
-	"fdosboot- boot from a dos floppy file\n",
+	"boot from a dos floppy file",
 	"[loadAddr] [filename]\n"
 );
 
 U_BOOT_CMD(
 	fdosls,	2,	0,	do_fdosls,
-	"fdosls  - list files in a directory\n",
+	"list files in a directory",
 	"[directory]\n"
 );