OpenJDK 11: Adding jdk.internal.reflect to allowed package list

As part of the migration to OpenJDK 11, sun.reflect has moved to
jdk.internal.reflect. For now we'll have both packages available
as new code uses the jdk.internal version.

Test: m
Bug: 188889082
Bug: 190791083
Change-Id: Ib03c9c8c346daebd7d97387817b506095f5ec693