DO NOT MERGE Add another MCC/MNC override for Guam to telephonylookup.xml [R]. MCCMNC:310470 was added to Guam mobile network. Bug: 210384434 Test: presubmit only Change-Id: I431f96bd60d59364673a0d0848268cb8e18a55cf Merged-In: I431f96bd60d59364673a0d0848268cb8e18a55cf (cherry picked from commit 9c07132ed6193447f8bd8d1be91404019fc1b565)