drm/amd/display: Destroy aux_engines only once

[Why]
In the dce112 function to destroy the resource pool, engines
(the aux engines) is destroyed twice.  This has no ill effects
but is a tad redundant.

[How]
Remove the redundant call
Signed-off-by: David Francis <David.Francis@amd.com>
Reviewed-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dce112/dce112_resource.c

@@ -677,9 +677,6 @@ static void destruct(struct dce110_resource_pool *pool)
 			pool->base.timing_generators[i] = NULL;
 		}
 
-		if (pool->base.engines[i] != NULL)
-			dce110_engine_destroy(&pool->base.engines[i]);
-
 	}
 
 	for (i = 0; i < pool->base.stream_enc_count; i++) {