Use PostScript name as a key of updated font map

Bug: 185818011
Test: atest FontManagerTest
Test: atest UpdatableFontDirTest
Test: atest UpdatableSystemFontTest
Test: atest FontFamilyUpdateRequestTest
Test: atest PersistentSystemFontConfigTest
Test: atest SystemFontsUniqueNameTest

Change-Id: I78e6ee962dbd50201105599361727b71de11cf2a
4 files changed