Fallback hyphenation for minority Indic languages

Minority Indic languages now fallback to available patterns for an
existing major language written in the same script, since the Indic
patterns are script-based anyway.

Change-Id: Ie04b97904e2b7d1b4c1fcd2f3cfc41f76ed8c7d9
Fixes: 67751731
Test: mmm -j frameworks/base/core/jni