Refactor how jni_libs dependencies are added

This CL brings three changes in how jni_libs are depended on.

1. SDK variants of the jni_libs are depended on only when they can be
   embedded. This is because SDK variants are not installable.
Previously, app could depend on SDK variants without embedding them, but
this didn't cause a problem because the installation of the jni libs was
done in Make. However, as it's done in Soong, we need to depend on a
correct variant.

2. Non-SDK variants of the jni_libs are now tagged with jniInstallTag.
   This automatically installs the libraries along with the app. The
installation of the jni libs is no longer done in app.

3. checking of the sdk version of the jni libs is done only when they
   are embedded. Doing the check even when the libs are not embedded
triggers a lot of false alarms. Note that with #1, many platform apps
have started depending on non-SDK variants.

Bug: 330276359
Test: m
Change-Id: I1bc9ceb8f79b102caeb23476c3fb03989e184a91