hardware/libhardware: use proper nativehelper headers

libnativeheader exports headers under nativeheader. These were
available before incorrectly as global headers in order to give
access to jni.h.

Test: modules using hardware/libhardware find headers
Bug: 63762847
Change-Id: I94305b7ab189ca0f3f89f4d87be2b113857f461f
1 file changed