dzn: Fix the 2DMSArray case in dzn_image_get_dsv_desc()

Texture2DMSArray element is not initialized, making 2DMSArray DS
views buggy.

Reported-by: Erik Faye-Lund <erik.faye-lund@collabora.com>
Reviewed-by: Erik Faye-Lund <erik.faye-lund@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/17158>

src/microsoft/vulkan/dzn_image.c

@@ -419,6 +419,12 @@ dzn_image_get_dsv_desc(const struct dzn_image *image,
       dsv_desc.Texture2DArray.FirstArraySlice = range->baseArrayLayer;
       dsv_desc.Texture2DArray.ArraySize = layer_count;
       break;
+   case D3D12_DSV_DIMENSION_TEXTURE2DMSARRAY:
+      dsv_desc.Texture2DMSArray.FirstArraySlice = range->baseArrayLayer;
+      dsv_desc.Texture2DMSArray.ArraySize = layer_count;
+      break;
+   default:
+      unreachable("Invalid view dimension");
    }
 
    return dsv_desc;