Add explicit dependencies on jni_headers

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

Also remove unnecessary jni.h includes from PathParser.{h,cpp}.

Bug: 152482542
Test: lunch aosp_x86_64 && m checkbuild
Change-Id: Ib18afa3d2c93ed3ce69204286d5177991100fd7e
Exempt-From-Owner-Approval: build refactoring