i965/gen9: Plugin the code for selecting YF/YS tiling on skl+

i965/gen9: Plugin the code for selecting YF/YS tiling on skl+

Buffers with Yf/Ys tiling end up using meta upload / download
paths or the blitter for cases where they used tiled_memcpy paths
in case of Y tiling. This has exposed some bugs in meta path. To
avoid any piglit regressions on SKL this patch keeps the Yf/Ys
tiling disabled at the moment.

V3: Make brw_miptree_choose_tr_mode() actually choose TRMODE. (Ben)
    Few cosmetic changes.
V4: Get rid of brw_miptree_choose_tr_mode().
    Take care of all tile resource modes {Yf, Ys, none} for all
    generations at one place.

Signed-off-by: Anuj Phogat <anuj.phogat@gmail.com>
Reviewed-by: Ben Widawsky <ben@bwidawsk.net>