Add more character sets

Add more character sets in CharacterSets.java to support more charsets.
These charsets are from http://www.iana.org/assignments/character-sets/
If MMS contains undefined charset value the corresponding field may not
be parsed correctly.
These charsets are from http://www.iana.org/assignments/character-sets/

Test: Receive MMS contains extended charsets texts, check if the text
could be parsed correctly.

Bug: 143253159

Change-Id: Id501dbaa9dfcc2cb28089430ed0b1bd3f2906bed