Reference nativehelper/jni.h as jni.h

nativehelper will no longer export nativehelper/jni.h so that everywhere
can reference this file with the same name.

Bug: 63762847
Change-Id: I3e58d478a2eb17b19db540414545a3c1f9c381af
(cherry picked from commit 98f40c71399e63f2b10cf6e3dffbbcea84d52490)
1 file changed