brcm-egl: Disambiguate wl_registry

Include wayland-client.h to disambiguate between QtWaylandClient::wl_registry
and wl_registry.

Change-Id: Idf33fd56a6b2c2436f5cbabc953980d05826ebba
Reviewed-by: Olivier Blin <qt@blino.org>
Reviewed-by: Giulio Camuffo <giulio.camuffo@jollamobile.com>