radv: fix CLEAR_STATE packet length.

Looking at shader traces I noticed some registers were missing,
one of them was being eaten by the wrong clear state length.

Fixes: 4f42ea4dc (radv: use CLEAR_STATE for initializing some registers)
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Reviewed-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

src/amd/vulkan/si_cmd_buffer.c

@@ -341,7 +341,7 @@ si_emit_config(struct radv_physical_device *physical_device,
 	radeon_emit(cs, CONTEXT_CONTROL_SHADOW_ENABLE(1));
 
 	if (physical_device->has_clear_state) {
-		radeon_emit(cs, PKT3(PKT3_CLEAR_STATE, 1, 0));
+		radeon_emit(cs, PKT3(PKT3_CLEAR_STATE, 0, 0));
 		radeon_emit(cs, 0);
 	}