Update fontchain_linter.py to support more flags.

Update fontchain_linter.py to support more flags.

Android Q will support all region flags in UNSUPPORTED_FLAGS list.
BL - Saint Barthélemy
BQ - Caribbean Netherlands
MQ - Martinique
RE - Réunion
TF - French Southern Territories

Bug: 127811703
Test: Verified on device.
Test: m fontchain_lint
Test: minikin_tests --gtest_filter=EmojiTest.cpp
Test: atest cts/tests/tests/text/src/android/text/cts/EmojiTest.java
Test: atest frameworks/base/core/tests/coretests/src/android/text/EmojiTest.java
Change-Id: Ice1fb10af35dc4e180735d9712167b71635920da