[Telephony] Fix the display name cannot be updated after OTA

- After OTA, if the priority of the name source is lower,
    the displayName cannot be updated.
- If the carrier would like to display name from PNN but the value of carrier config
    is removed in the next version, the display name cannot be updated correctly since
    the priority is lower than carrier config.

Bug: 159232126
Test: Manual and atest
Change-Id: Ia1824a684af388682718263fc6154b4f5fb27b33