hasvk: Delete enum anv_depth_reg_mode

This is only used on gfx12+.

Reviewed-by: Lionel Landwerlin <[email protected]>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/42394>

src/intel/vulkan_hasvk/anv_private.h

@@ -2470,12 +2470,6 @@ struct anv_cmd_graphics_state {
    bool has_uint_rt;
 };
 
-enum anv_depth_reg_mode {
-   ANV_DEPTH_REG_MODE_UNKNOWN = 0,
-   ANV_DEPTH_REG_MODE_HW_DEFAULT,
-   ANV_DEPTH_REG_MODE_D16_1X_MSAA,
-};
-
 /** State tracking for compute pipeline
  *
  * This has anv_cmd_pipeline_state as a base struct to track things which get
@@ -2532,13 +2526,6 @@ struct anv_cmd_state {
     */
    bool                                         hiz_enabled;
 
-   /* We ensure the registers for the gfx12 D16 fix are initialized at the
-    * first non-NULL depth stencil packet emission of every command buffer.
-    * For secondary command buffer execution, we transfer the state from the
-    * last command buffer to the primary (if known).
-    */
-   enum anv_depth_reg_mode                      depth_reg_mode;
-
    bool                                         conditional_render_enabled;
 
    /**