Deprecate glDriverFallback logging

Based on the discussion in
https://googleplex-android-review.git.corp.google.com/c/platform/frameworks/native/+/28925365/comment/148a6605_aa13457e/
"glDriverFallback" is no longer needed.  Hence the CL removes it.

previously it's okay to fallback so the logging was recording the cases when an intent to load GL_UPDATED or ANGLE is somehow overwritten, ex) loading failure and fallback to something else.

The current behavior now is to fail loudly if loading ANGLE or GL_UPDATED fails, no more fallback. Therefore, no need to log the fallback cases.

Test: $abtd test --test_location=remote  --tag=test_loading_metric_fix --reference_build_id=12276316 --v2_test_name=angle_CtsAngleIntegrationHostTestCases_git_main th:cl:28948939:husky-trunk_staging-userdebug:git_main "$PROD_CONFIG", [result](https://android-build.corp.google.com/builds/abtd/run/L34800030006075559)
Test: $abtd test --test_location=remote  --tag=test_loading_metric_fix --reference_build_id=12276316 --v2_test_name=angle_CtsAngleIntegrationHostTestCases_git_main_gles th:cl:28948939:husky_angle-next-userdebug:git_main "$PROD_CONFIG", [result](https://android-build.corp.google.com/builds/abtd/run/L88800030006075562)
Test: $abtd test --test_location=remote  --tag=test_loading_metric_fix --reference_build_id=12276316 --v2_test_name=angle_CtsAngleIntegrationHostTestCases_git_main_gles th:cl:28948939:husky-next-userdebug:git_main "$PROD_CONFIG", [result](https://android-build.corp.google.com/builds/abtd/run/L48800030006011636)

Flag: EXEMPT bugfix
Test: default presubmit
Bug: b/359337792
Change-Id: If35ec31c2b34d3cd1c4bc8681f00404961a5eeed