Revert "Remove stubs for libnativehelper."

This reverts commit 5e36eaa15564895d43845cdbfcad13fd08300266.

Test: Flash and boot
Test: mmma libnativehelper
Test: atest -a libnativehelper/tests
Test: atest CtsJdwpTestCases
Bug: 113373927
Change-Id: I40589e7115784f049945b5b73650457694e452f0
2 files changed