[BE] Delete IS_SPMM_AVAILABLE() logic

[malfet]

Stack from ghstack (oldest at bottom):

• -> [BE] Delete IS_SPMM_AVAILABLE() logic #155296

As it's been available on all currently supported platforms

[pytorch-bot]

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✅ You can merge normally! (1 Unrelated Failure)

As of commit ae19b3d with merge base ca0c298 ():

UNSTABLE - The following job is marked as unstable, possibly due to flakiness on trunk:

• pull / linux-jammy-py3-clang12-executorch / build (gh) (#150261)
  Final attempt failed. Child_process exited with error code 1

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[malfet]

@pytorchbot merge

[pytorchmergebot]

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