i965: Drop redundant check for non-tiled depth buffer

Depth buffers are always Y-tiled. In brw_miptree_choose_tiling()
driver opts to use linear buffers for small and 1D but this does
not apply for depth - GL_DEPTH_COMPONENT and GL_DEPTH_STENCIL_EXT
are considered first.

Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Signed-off-by: Topi Pohjolainen <topi.pohjolainen@intel.com>

src/mesa/drivers/dri/i965/brw_misc_state.c

@@ -383,8 +383,7 @@ brw_emit_depth_stencil_hiz(struct brw_context *brw,
    OUT_BATCH((depth_mt ? depth_mt->surf.row_pitch - 1 : 0) |
              (depthbuffer_format << 18) |
              (BRW_TILEWALK_YMAJOR << 26) |
-             ((depth_mt ? depth_mt->surf.tiling != ISL_TILING_LINEAR : 1)
-              << 27) |
+             (1 << 27) |
              (depth_surface_type << 29));
 
    if (depth_mt) {

src/mesa/drivers/dri/i965/gen6_depth_state.c

@@ -121,8 +121,7 @@ gen6_emit_depth_stencil_hiz(struct brw_context *brw,
              ((enable_hiz_ss ? 1 : 0) << 21) | /* separate stencil enable */
              ((enable_hiz_ss ? 1 : 0) << 22) | /* hiz enable */
              (BRW_TILEWALK_YMAJOR << 26) |
-             ((depth_mt ? depth_mt->surf.tiling != ISL_TILING_LINEAR : 1)
-              << 27) |
+             (1 << 27) |
              (surftype << 29));
 
    /* 3DSTATE_DEPTH_BUFFER dw2 */