[cmdline] Add margin options to the "console" command

Signed-off-by: Michael Brown <mcb30@ipxe.org>

src/hci/commands/console_cmd.c

 		      struct console_options, config.width, parse_integer ),
 	OPTION_DESC ( "y", 'y', required_argument,
 		      struct console_options, config.height, parse_integer ),
+	OPTION_DESC ( "left", 'l', required_argument,
+		      struct console_options, config.left, parse_integer ),
+	OPTION_DESC ( "right", 'r', required_argument,
+		      struct console_options, config.right, parse_integer ),
+	OPTION_DESC ( "top", 't', required_argument,
+		      struct console_options, config.top, parse_integer ),
+	OPTION_DESC ( "bottom", 'b', required_argument,
+		      struct console_options, config.bottom, parse_integer ),
 	OPTION_DESC ( "depth", 'd', required_argument,
 		      struct console_options, config.depth, parse_integer ),
 	OPTION_DESC ( "picture", 'p', required_argument,