Remove remaining libcore entries from light greylist

Removes the libcore entries that have been added since the previous
entries were removed. The entries are now specified using
UnsupportedAppUsage annotations.

This was tested by making and then manually checking that the generated
out/target/common/obj/PACKAGING/hiddenapi-light-greylist.txt was the
same (after sorting) before and after this change.

Test: see above
Bug: 117818301
Change-Id: Ie2ab636f61697664eced59969d12aa46103d96a1