Remove the wl_surface functions from QWaylandWindow

Change-Id: Ie2b79e713364b2b76f772d18910742188f9ac70e
Reviewed-by: Andy Nichols <andy.nichols@digia.com>
Remove unneeded functions

The QtWayland scanner makes these functions just relay functions, and
we'r converting the attributes when we don't need to, so lets just use
the inherited functions directly

Change-Id: Icae2270c59cc80088e5a452bda88b552b6396634
Reviewed-by: Andy Nichols <andy.nichols@digia.com>