Fix license header incorrectly identifying a GPLv2+CE file as Apache 2.

Libcore commit f9b6ef9f20cb3b0410c0efbacc77533f33687e5f added the file
ojluni/src/main/java/time/zone/IcuZonerulesProvider.java and
(incorrectly, accidentally) added an Apache 2 license header to the file
when it should have been a GPLv2+CE license header.

Only the license part of the header is touched; the copyright part of
the header is left unchanged, consistent with AOSP copyrighted files
with Apache 2 license in luni/.

Test: Treehugger build succeeds.
Bug: 38120985

Change-Id: I188ab257ff28ac30ec9ca6566c13f48c92a6bf36
1 file changed