glamor: Change glamor_egl_init API.
Slightly change the API glamor_egl_init, as this initialization is to initialize the display not the screen, we should call it in xxx_preinit rather than xxxScreenInit(). we change the input parameter as below, as in preInit, the screen may not be allocated at all. And in glamor_egl_init, it will not call glamor_init. Driver should call glamor_init at screen_init stage. Signed-off-by: Zhigang Gong <email@example.com>