Revert "Implement family fallback." DO NOT MERGE

This reverts commit 0d253e46.

The original CL changed Typeface internal methods and broke
TypefaceCompatApi26Impl in support library which uses reflections.
Ideally, TypefaceCompatApi26Impl must fall back to public API
implementation but due to lack of method availability check, it ended up
crashing the application.

The original patch didn't change any behaviors in MR1, so reverting
that change is the best solution for MR1.

Bug: 64033594
Change-Id: Ie86afeb1b809e57915d62c1db5a70c8d210d2354
Test: N/A