i965/i915: Add colorspace support to YUV sampling

Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Reviewed-by: Rob Clark <robdclark@chromium.org>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6122>

src/intel/compiler/brw_compiler.h

@@ -210,6 +210,8 @@ struct brw_sampler_prog_key_data {
    uint32_t xy_uxvx_image_mask;
    uint32_t ayuv_image_mask;
    uint32_t xyuv_image_mask;
+   uint32_t bt709_mask;
+   uint32_t bt2020_mask;
 
    /* Scale factor for each texture. */
    float scale_factors[32];