android_media_MediaMuxer_setLocation: amended signature.

Change parameter `nativeObject` from type `jint` to `jlong` to match its JNI
signature.

Bug: 12890910

(cherry picked from commit 3cb78498d3f664f541ba7d28f4543cf8c12733f1)

Reported-By: ashok.bhat@arm.com, marcus.oakland@arm.com

Change-Id: I624dfb41485be823d31797514664d3a5f9e52eb0