Add product apk support from libnativeloader

Currently libnativeloader appends vendor lib path if apk is from vendor
partition. Similar to this, as part of mainline core, we should add
product lib path if apk if from product partition.

Bug: 124705551
Test: m -j && tested from crosshatch with product apps (such as Wallpaper)
Change-Id: I8690167ca8098015c8ae4bbb4f028404c5e94dc0