drivers/misc: (aspeed-lpc-snoop): Add ast2400 to compat

This driver can be used on the aspeed ast2400 with minor
modifications.

Tested: ast2400 on quanta-q71l

Signed-off-by: Patrick Venture <venture@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>