[bugfix] handle large bucket minimums correctly

[kzawora-intel]

This bugfix addresses incorrect lower boundary handling for bucketing

Previous behavior:

INFO 09-03 19:36:28 habana_model_runner.py:564] Prompt bucket config (min, step, max_warmup) bs:[64, 32, 64], seq:[768, 128, 768]
INFO 09-03 19:36:28 habana_model_runner.py:577] Generated 12 prompt buckets: [(32, 128), (32, 256), (32, 384), (32, 512), (32, 640), (32, 768), (64, 128), (64, 256), (64, 384), (64, 512), (64, 640), (64, 768)]
INFO 09-03 19:36:28 habana_model_runner.py:582] Omitted 0 prompt buckets due to exceeded token budget (max_num_batched_tokens=131072)
INFO 09-03 19:36:28 habana_model_runner.py:590] Decode bucket config (min, step, max_warmup) bs:[64, 128, 64], seq:[768, 128, 1024]
INFO 09-03 19:36:28 habana_model_runner.py:601] Generated 8 decode buckets: [(64, 128), (64, 256), (64, 384), (64, 512), (64, 640), (64, 768), (64, 896), (64, 1024)]
INFO 09-03 19:36:28 habana_model_runner.py:606] Omitted 0 decode buckets due to exceeded token budget (max_num_batched_tokens=131072)

Min seq len dimension is set to 768, but buckets with seq_len=128-768 are present

Current behavior:

INFO 09-03 19:45:42 habana_model_runner.py:563] Prompt bucket config (min, step, max_warmup) bs:[64, 32, 64], seq:[768, 128, 768]
INFO 09-03 19:45:42 habana_model_runner.py:576] Generated 1 prompt buckets: [(64, 768)]
INFO 09-03 19:45:42 habana_model_runner.py:581] Omitted 0 prompt buckets due to exceeded token budget (max_num_batched_tokens=131072)
INFO 09-03 19:45:42 habana_model_runner.py:589] Decode bucket config (min, step, max_warmup) bs:[64, 128, 64], seq:[768, 128, 1024]
INFO 09-03 19:45:42 habana_model_runner.py:600] Generated 3 decode buckets: [(64, 768), (64, 896), (64, 1024)]
INFO 09-03 19:45:42 habana_model_runner.py:605] Omitted 0 decode buckets due to exceeded token budget (max_num_batched_tokens=131072)

No bucket with seq_len < 768 is captured

[madamczyk-intel]

LGTM!