Don't rely on the GSM 03.38 charset instance.

According to [1] it's considered deprecated and the corresponding Java
code should be used instead.

[1] https://android-review.googlesource.com/#/c/60430/

Change-Id: I28ff9487312fb5633914ed80b3e2e2bc62222cd2
Merge "Don't rely on the GSM 03.38 charset instance." into cm-10.2