Remove exception; trt-rtx supports bf16.

[SandSnip3r]

Description

Remove a check for trt-rtx which throws an exception if bf16 is used. trt-rtx does support bf16: https://docs.nvidia.com/deeplearning/tensorrt-rtx/latest/getting-started/support-matrix.html#hardware-and-precision

Type of change

• New feature (non-breaking change which adds functionality)

Checklist:

• My code follows the style guidelines of this project (You can use the linters)
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas and hacks
• I have made corresponding changes to the documentation
• I have added tests to verify my fix or my feature
• New and existing unit tests pass locally with my changes
• I have added the relevant labels to my PR in so that relevant reviewers are notified

[meta-cla]

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[SandSnip3r]

Other places mention that trt-rtx does not support bf16:
tests/py/dynamo/llm/test_llm_models.py (lines 19-20)
tests/py/dynamo/models/test_dtype_support.py (line 205)
tests/py/dynamo/models/test_models_export.py (lines 411-412, 472-473)
tests/py/dynamo/models/test_dyn_models.py (lines 192-193)
tests/py/dynamo/models/test_models.py (lines 198-199, 240-241, 287-288, 430, 532, 581)
tests/py/dynamo/conversion/test_casts.py (line 72)
tests/py/dynamo/conversion/test_binary_ops_aten.py (line 242)