Bump apn version to 8 for TelephonyProvider compliance

Summary:
src/com/android/providers/telephony/TelephonyProvider.java
line 203: Sanity check. Force internal version and
confidential versions to agree

Change-Id: Ia91705f3fa12c62fce78a46fd484e4a1c4dd8e2b

Test Plan: needs gsm and cdma tests

Reviewers: randall.rushing, Mustaavalkosta, michyprima, Roach, synergy

Reviewed By: synergy

Differential Revision: http://review.codefirex.com/D315