v3d/cmd_buffer: emit flat_shade/noperspective/centroid flags

We just emit the default ZERO_ALL values, to cover at least the cases
where that is enough. Need to emit non-default values if needed.

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6766>
diff --git a/src/broadcom/vulkan/v3dv_cmd_buffer.c b/src/broadcom/vulkan/v3dv_cmd_buffer.c
index ca215af..615a7ae 100644
--- a/src/broadcom/vulkan/v3dv_cmd_buffer.c
+++ b/src/broadcom/vulkan/v3dv_cmd_buffer.c
@@ -1633,6 +1633,11 @@
    }
 
    cl_emit_prepacked(&job->bcl, &pipeline->cfg_bits);
+
+   /* FIXME: hardcoded values */
+   cl_emit(&job->bcl, ZERO_ALL_FLAT_SHADE_FLAGS, flags);
+   cl_emit(&job->bcl, ZERO_ALL_NON_PERSPECTIVE_FLAGS, flags);
+   cl_emit(&job->bcl, ZERO_ALL_CENTROID_FLAGS, flags);
 }
 
 /* FIXME: C&P from v3dx_draw. Refactor to common place? */