am e5e4282a: Enable the call setting when the VoIP feature is supported.

Merge commit 'e5e4282af1d2d4277c8e2c13a312be0187f44257' into gingerbread-plus-aosp

* commit 'e5e4282af1d2d4277c8e2c13a312be0187f44257':
  Enable the call setting when the VoIP feature is supported.