Stop supporting broken font fallback

The supporting broken font is over engineering and it works the same as
default font fallback in most cases.
Removing fallback logic and return default fallback.

Test: bit CtsTextTestCases:*
Test: bit CtsGraphicsTestCases:*
Test: ./gradlew appcompat-v7:connectedDebugAndroidTest
Test: ./gradlew support-compat:connectedDebugAndroidTest
Bug: 65024629
Change-Id: Ib3fc0d638c6aee904cdf865082f8d5ae7d31ba48