skl_main_to_aux_plane
int skl_main_to_aux_plane(const struct drm_framebuffer *fb, int main_plane);
int aux_plane = skl_main_to_aux_plane(fb, color_plane);
int aux_plane = skl_main_to_aux_plane(fb, 0);
int aux_plane = skl_main_to_aux_plane(fb, 0);
skl_main_to_aux_plane(fb, uv_plane) : 0;