intel/dev: Set 'has_flat_ccs' flag for DG2

The code paths of flat ccs should be working on DG2 because
they are routed by other conditions like GFXVer so far. But
using this flag is the intended way, and we need to have
this change prior to updating these conditions with the flag.

Ref: 5262475242 ("intel/dev: Add a has_flat_ccs flag")

Signed-off-by: Jianxun Zhang <jianxun.zhang@intel.com>
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>
Reviewed-by: Nanley Chery <nanley.g.chery@intel.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/20043>

src/intel/dev/intel_device_info.c

@@ -1065,7 +1065,8 @@ static const struct intel_device_info intel_device_info_sg1 = {
    .apply_hwconfig = true,                                      \
    .has_coarse_pixel_primitive_and_cb = true,                   \
    .has_mesh_shading = true,                                    \
-   .has_ray_tracing = true
+   .has_ray_tracing = true,                                     \
+   .has_flat_ccs = true
 
 static const struct intel_device_info intel_device_info_dg2_g10 = {
    DG2_FEATURES,