layout: Add missing hooks for other surface roles

layout: Add missing hooks for other surface roles

We are missing the activate_by_default hooks for split, pop-up and and
fullscreen roles. Part of that is due to the fact that these roles are
handled a bit differently that the remote and desktop roles.

Note, these hooks are different than the commit ones -- which are
'installed' a bit earlier. This means that there was still a possiblity
one might've used that hook to retrieve the surface role for instance,
and act accordingly.

Also, note that we allow for pop-up/dialogs be activated by using the
deliberate 'activate' request, which allows one to customize the policy
to deny certain pop-up/dialogs to be activated by default, but allow do
so explictly when using the 'activate' request.

Bug-AGL: SPEC-3494

Reported-by: Scott Murray <scott.murray@konsulko.com>
Signed-off-by: Marius Vlad <marius.vlad@collabora.com>
Change-Id: I634bbb5915e65880c1d47363cf6dae529feac9d2