Fix broken import in test_deepseek_mla_ops.py after SDPA test migration (#37919)

Regression introduced in 89175b6 (#37713) which moved MLA test files
from tests/tt_eager/.../misc/ to tests/ttnn/unit_tests/operations/sdpa/.
The file test_deepseek_mla_ops.py was not moved but still imported
page_table_setup, to_paged_cache, and from_paged_cache from the old path
(test_flash_multi_latent_attention_decode), causing a
ModuleNotFoundError during pytest collection and failing all nightly L2
eager unit test jobs.

Update the import to point to the new location in mla_test_utils.py.

Nightly L2 run wiht fast dispatch unit tests
https://github.com/tenstorrent/tt-metal/actions/runs/22032896930

Co-authored-by: Pavle Josipovic <pjosipovic@tenstorrent.com>
Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: 3 people

tests/tt_eager/python_api_testing/unit_testing/misc/test_deepseek_mla_ops.py

@@ -13,7 +13,7 @@
     comp_allclose,
     comp_pcc,
 )
-from tests.tt_eager.python_api_testing.unit_testing.misc.test_flash_multi_latent_attention_decode import (
+from tests.ttnn.unit_tests.operations.sdpa.mla_test_utils import (
     page_table_setup,
     to_paged_cache,
     from_paged_cache,