use gcnArchName to get gpu_arch

[sidamd]

The following warning is emitted incorrectly. MI300X is gfx942.

Warning: Unsupported ROCm GPU architecture: AMD Instinct MI300X
Currently only gfx942 is supported. Compiling only for gfx942.

Use gcnArchName to extract gpu_arch value to suppress the above warning.

Here is an example output of get_device_properties() that shows the gcnArchName field value on MI300X platform.

>>> torch.cuda.get_device_properties(0)
_CudaDeviceProperties(name='AMD Instinct MI300X', major=9, minor=4, gcnArchName='gfx942:sramecc+:xnack-', total_memory=196592MB, multi_processor_count=304, uuid=65303434-3830-3136-3839-323537666234, pci_bus_id=5, pci_device_id=0, pci_domain_id=0, L2_cache_size=4MB)

With the above changes, the warning is not emitted during build on MI300X.
Used this command to build and test:

python3 -m build --wheel --no-isolation .

[pytorch-bot]

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