Remove blocksize 64 for quant/dequant functions#10
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This PR removes 64 blocksize for quantize and dequantize functions, as ROCm warpsize doesn't support that case.
It also skips that case for tests which use quantize/dequantize functions. These are the tests enabled with this PR:
test_autograd.py::test_matmul_fp8
test_functional.py::test_dynamic_blockwise_quantization
test_functional.py::test_4bit_compressed_stats