dzn: drop needless includes

These include either dzn_nir.h or dzn_internal.h which already includes
this header.

Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>
Reviewed-by: Louis-Francis Ratté-Boulianne <lfrb@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/15790>

src/microsoft/vulkan/dzn_nir.c

@@ -21,8 +21,6 @@
  * IN THE SOFTWARE.
  */
 
-#include <directx/d3d12.h>
-
 #include "spirv_to_dxil.h"
 #include "nir_to_dxil.h"
 #include "nir_builder.h"

src/microsoft/vulkan/dzn_pipeline.cpp

@@ -31,7 +31,6 @@
 #include "vk_util.h"
 #include "vk_format.h"
 
-#include <directx/d3d12.h>
 #include <dxguids/dxguids.h>
 
 #include "util/u_debug.h"