Delete unused QAT utils code (#1579) #491

Job	Run time
generate-matrix / generate	4s
pytorch/ao / wheel-py3_9-cpu	6m 47s
pytorch/ao / wheel-py3_9-xpu	14m 53s
pytorch/ao / wheel-py3_10-cpu	6m 56s
pytorch/ao / wheel-py3_10-xpu	15m 0s
pytorch/ao / wheel-py3_11-cpu	7m 21s
pytorch/ao / wheel-py3_11-xpu	14m 17s
pytorch/ao / wheel-py3_12-cpu	7m 16s
pytorch/ao / wheel-py3_12-xpu	15m 7s
pytorch/ao / wheel-py3_13-cpu	8m 26s
pytorch/ao / wheel-py3_13-xpu	14m 47s
pytorch/ao / upload / wheel-py3_9-cpu	26s
pytorch/ao / upload / wheel-py3_9-xpu	21s
pytorch/ao / upload / wheel-py3_10-cpu	21s
pytorch/ao / upload / wheel-py3_10-xpu	28s
pytorch/ao / upload / wheel-py3_11-cpu	27s
pytorch/ao / upload / wheel-py3_11-xpu	25s
pytorch/ao / upload / wheel-py3_12-cpu	21s
pytorch/ao / upload / wheel-py3_12-xpu	22s
pytorch/ao / upload / wheel-py3_13-cpu	20s
pytorch/ao / upload / wheel-py3_13-xpu	25s
	1h 54m 50s

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