dEQP-GLES3.functional.state_query.fbo.framebuffer_attachment_x_size_initial queries GL_FRAMEBUFFER_ATTACHMENT_DEPTH_SIZE on the window system depth buffer, and expects to get a proper value (16, 24, 32); we are incorrectly returning 0.

intel_alloc_private_renderbuffer_storage does:

   rb->_BaseFormat = _mesa_base_fbo_format(ctx, internalFormat);

Here, internalFormat is GL_DEPTH_COMPONENT.  _mesa_base_fbo_format only returns GL_DEPTH_COMPONENT in desktop GL.  In ES, it returns 0.

So, we don't get a proper rb->_BaseFormat set, and this makes the query fail.