Dialer: Customize features for regional package

1. Add engineering mode secret code "*#7548135*#";
2. Use secret code to trigger factory test mode;
3. Hide diag port and to open diag port menu need to dial *76278#.

Change-Id: Iae26756824f1f2cc9693546eb39a1a45761e4f88
(cherry picked from commit 144951edf8fdc556f81ca7e1bee180a4ba64f9d4)