Include in hidden API dark greylist based on package name

Dark greylist has so far been populated with the remaining class
members of classes listed on the light greylist. This patch changes
the rule to include all remaining classes and class members in the
same package (sub-packages not included).

Bug: 64382372
Test: make -j64 out/target/common/obj/PACKAGING/hiddenapi-dark-greylist.txt
Change-Id: Icf3f60f1e776f092103c612fc3995ce0e66617ea