Revert "Fix for Character.getName throwing NPE."

The original commit introduced uniName.dat as a temporary measure
because OpenJDK code relied on it. Since commit
2614ae16 reimplemented
java.lang.Character on top of ICU, it is no longer needed.
Therefore, this CL reverts it.

This reverts commit f1bca62f.

Bug: 111250351
Test: Treehugger
Test: CtsLibcoreTestCases

Change-Id: I0b041bce391610a7cc87764ed821bb22c1bff571