Add jni_headers dependency to libshim_jni

Preparation for removing implicit include paths for jni.h from soong.

Bug: 152482542
Test: m checkbuild
Change-Id: Ie8d55627d835d811ac601fb1e38952e9c1d0903f
Merged-In: Ie8d55627d835d811ac601fb1e38952e9c1d0903f
(cherry picked from commit cef4f844)