apns: Add APNs for China Telecom Global GD & HK & MO prepaid SIM card

* Taken from [1]. (Actually, I've only used [2] so far and I can't
  test [1] until I arrive at Hong Kong again)
* These APNs are used only when in Hong Kong, not in Guangdong.
  I'm unsure about Macau yet.

[1]: https://dumps.tadiphone.dev/dumps/xiaomi/dada/-/blob/missi-user-15-AQ3A.240812.002-OS2.0.101.0.VOCCNXM-release-keys/product/etc/apns-conf.xml#L38564
[2]: https://dumps.tadiphone.dev/dumps/redmi/ruby/-/blob/missi_phone_global-user-13-TP1A.220624.014-V14.0.6.0.TMOMIXM-release-keys/product/etc/apns-conf.xml#L38008

Change-Id: Ib557e172c24105692b3c72372dba0a8b8e112273