d3d12: Don't block DISPLAY based on format for non-Windows

On platforms where we're not using DXGI swapchains, there's no reason
to disallow DISPLAY for formats like B5G6R5. In fact, on Android,
we need to support this format as BIND_DISPLAY.

Reviewed-by: Bill Kristiansen <billkris@microsoft.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/16154>

src/gallium/drivers/d3d12/d3d12_screen.cpp

@@ -654,6 +654,7 @@ d3d12_is_format_supported(struct pipe_screen *pscreen,
       } else
          fmt_info_sv = fmt_info;
 
+#ifdef _WIN32
       if (bind & PIPE_BIND_DISPLAY_TARGET &&
          (!(fmt_info.Support1 & D3D12_FORMAT_SUPPORT1_DISPLAY) ||
             // Disable formats that don't support flip model
@@ -662,6 +663,7 @@ d3d12_is_format_supported(struct pipe_screen *pscreen,
             dxgi_format == DXGI_FORMAT_B5G6R5_UNORM ||
             dxgi_format == DXGI_FORMAT_B4G4R4A4_UNORM))
          return false;
+#endif
 
       if (bind & PIPE_BIND_DEPTH_STENCIL &&
           !(fmt_info.Support1 & D3D12_FORMAT_SUPPORT1_DEPTH_STENCIL))