Update to use nativehelper/JNIPlatformHelp.h

Reflects refactoring of JNI helper code that depends on private
methods within libnativehelper.

Bug: 151443957
Test: Treehugger
Change-Id: I7af128f42ae89a77a8e3fb113ea533331153c535
Merged-In: I7af128f42ae89a77a8e3fb113ea533331153c535
Exempt-From-Owner-Approval: cherry pick
(cherry picked from commit 329c612e3d5ae440bf13e1f5fc9a4012263524e9)
48 files changed