Fix test data to use my_test_data_file_pairs

The format of LOCAL_TEST_DATA when provided by Soong can included a
third colon-separated field with an extra relative path that is not
being handled when assigning to ALL_MODULES.$(my_register_name).TEST_DATA.
Use my_test_data_file_pairs instead, which has already been transformed
to a src:dest pair.

Bug: 311428265
Test: examine module-info.json
Change-Id: I3a089cc24ea1492f1f7cf891c73ee7b43f273bb3