staging: r8188eu: Make mult-byte entities in dhcp header be big endian

The 16- and 32-bit quantities in the dhcp message definition must be
big endian.

Acked-by: Phillip Potter <phil@philpotter.co.uk>
Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
Link: https://lore.kernel.org/r/20210821151459.26078-1-Larry.Finger@lwfinger.net


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>