Add classpath fragment property to skip proto generation.

This must always be true for updatable apexes, but is not necessary
for non-updatable apexes like com.android.i18n.

In a follow up this will be used to figure out whether apex boot jars
should be bundled into platform_bootclasspath.

Bug: 191127295
Test: atest CtsClasspathsTestCases derive_classpath_test
Change-Id: Ib7dc5b057cb24955222fb97f3ff9da079f30ed77