Switch to using shared over local code for initializing ICU

A static library now exists in external/icu/android_utils.

Contains cherry-picks from commits:
4b60b068c27a40731bd4a0049cb632da18bf521d
2f3406517d1fd4486b8b90eb2635d784fad17a48

Bug: 21730722

Change-Id: Ibc264ed881465736ce74fa493deb83cc15f9fceb
2 files changed