Merge "Adds ALLOWED_NETWORK_TYPES_REASON_ENABLE_2G to PhoneInterfaceManager." am: 8a606f2c32

Original change: https://android-review.googlesource.com/c/platform/packages/services/Telephony/+/1642000

Change-Id: I308f6d8126d0cb0c773b728a9164d69f4aa514ed