Update API signature file to reflect the correct logp nullability

A matching patch to the fix in java.util.logging.Logging nullability.
See https://android-review.googlesource.com/c/platform/libcore/+/1096198/

Test: make -j update-api
Change-Id: I0b653de474b6162764cfa711eb967aada4c0ee50
1 file changed