Rename nativeHoldsLock to holdsLock and make it work on current thread

This change removes a difference between the Android Thread.java file
and OpenJDK 8u121-b13.

Test: make checkbuild, flash, CtsLibcoreTestCases
Bug: 74379469
Change-Id: I5a56771f6cb944c7a985c8fa2001980cf14413f4
1 file changed