Extend loadLibrary tests with apps in /system/priv-app, /system_ext,
and /product.

In /system_ext we run the same tests as in /system, because there
shouldn't be any difference between them.

For /product this records how it currently works, not what we want when
b/237572732 is fixed.

Test: atest -a libnativeloader_e2e_tests
Bug: 237572732
Change-Id: I4f35c8e3b271e7bf300d410e6952a4d9073fec6b
9 files changed