[dflash] Add BF16 support to GGUF loader

[metascroy]

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[pytorch-bot]

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❌ 1 New Failure, 19 Pending

As of commit 813b3a7 with merge base 8965e51 ():

NEW FAILURE - The following job has failed:

• pull / test-binary-size-linux-gcc / linux-job (gh)
  RuntimeError: Command docker exec -t 9b46292aeb11b91b568b457d7b4ef2bbfa98b27a579260e1b8f25d6e247c4685 /exec failed with exit code 1

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