Revert^2 "Add flagged api hide conditional to droidstubs"

This reverts commit 1180919d.

Test: go test ./java && m TARGET_PRODUCT=sdk TESTING_TARGET_RELEASE_NEXT=true nothing and inspect ninja command for generating stubs and verify the flag is included && m TARGET_PRODUCT=sdk TARGET_RELEASE=trunk_food nothing and inspect ninja command for generating stubs and verify the flag is not included
Bug: 299570421
Change-Id: I4967376c0236bad729398af80fa59b48dbab5f21