Always pass down the caller class to nativeLoad when it's known.

We need it to be able to detect when the caller is in a system image
partition and is trying to load a private native library in the same
partition.

Test: See https://r.android.com/2933611
Bug: 237577392
Change-Id: Iddfb47721cce5130a686767ec2536774d9283db4
1 file changed