Add explicit dependencies on jni_headers

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

Bug: 152482542
Test: m
Change-Id: I0152368f7f9f75a6ffff9b8578bdec0cd8cbe6fc
diff --git a/jni/Android.bp b/jni/Android.bp
index d24e419..82bf3d6 100644
--- a/jni/Android.bp
+++ b/jni/Android.bp
@@ -58,6 +58,7 @@
         "plugins/wprint_scaler.c",
     ],
 
+    header_libs: ["jni_headers"],
     local_include_dirs: [
         "include",
         "plugins/genPCLm/inc",