If a file is from a soong module it doesn't need the is_platform_generated...

If a file is from a soong module it doesn't need the is_platform_generated flag in compliance metadata

In soong-only build most of these platform-generated files have been converted to soong modules so the flag is_platform_generated is not needed any more

Bug: 324465531
Test: build/soong/tests/sbom_test.sh
Change-Id: I7d1d79a73d4c55262c1d351d989b6cb7e768affb