NXP: Fix BUCK paths after tests moved to generic_tests/

[rascani]

Summary

A previous change moved several NXP backend test files into a new generic_tests/ subdirectory but did not update the BUCK file. As a result the following buck targets failed to build with 'File not found' errors:

• executorch/backends/nxp/tests:test_batch_norm_fusion
• executorch/backends/nxp/tests:test_integration
• executorch/backends/nxp/tests:test_neutron_backend
• executorch/backends/nxp/tests:test_qdq_clustering_conv
• executorch/backends/nxp/tests:test_quantizer

Update the srcs paths to point at the new generic_tests/ locations.

[pytorch-bot]

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