Align the handling of no-mcc-mnc configs in vendor.xml with carrierconfig app am: 4fc47e4a1f am: 5dd439e18d am: 29bb818b42 am: 50d35183ef

Original change: https://android-review.googlesource.com/c/platform/tools/carrier_settings/+/1690689

Change-Id: I2bba9a3320c518c725161b33849bd47ee9a68366
tree: 3e2138982cecd7057a274f1b6ddaee6622ed7681
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