Relax requirement for text variation sequences

Previously, we insisted that in order for us to claim that a text variation
sequence is supported or to display it, it needs to be standardized already.
Now we accept any character as the base of a text variation sequence and
support it as far the font used to display it is not an emoji font.

Also fix a typo in a font name.

Test: Unit tests are updated and pass.

Bug: 30874706
Change-Id: I9660ec43aeee84303cfb825352a7f5029d036dd6

• libs/minikin/FontCollection.cpp[diff]
• tests/data/VariationSelectorTest-Regular.ttf[Renamed from tests/data/VarioationSelectorTest-Regular.ttf - diff]
• tests/data/VariationSelectorTest-Regular.ttx[Renamed from tests/data/VarioationSelectorTest-Regular.ttx - diff]
• tests/unittest/Android.mk[diff]
• tests/unittest/FontCollectionItemizeTest.cpp[diff]
• tests/unittest/FontCollectionTest.cpp[diff]
• tests/unittest/FontFamilyTest.cpp[diff]