LinuxKPI: Add xen/xen.h header

It contains proxy-implementation of xen_initial_domain() and
xen_pv_domain() required by latest drm-kmod.

Sponsored by: Serenity Cyber Security, LLC
Reviewed by: manu

LinuxKPI: Add xen/xen.h header

It contains proxy-implementation of xen_initial_domain() and
xen_pv_domain() required by latest drm-kmod.

Sponsored by: Serenity Cyber Security, LLC
Reviewed by: manu, bz
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D42797

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