egl: Stop requiring texture_3D_image for EGL 1.5
Neither VK-GL-CTS nor dri2_setup_screen() require it, unlike texture_2D_image and texture_cubemap_image. Crucially, older etnaviv generations and vc4 in general do not support 3d textures.
Thus drop the requirement in order to support EGL 1.5 across the board.
Related: