Merge "Revert "Use TelephonyManager#isEmergencyNumber() instead"" am: a281046577 am: d2eb366490

Original change: https://android-review.googlesource.com/c/platform/external/ims/+/1702032

Change-Id: I02353f7c812029f18bc8e0a4ae630d028904413e
tree: 61a6b105ad082b0816e25a1503d4a77d39457de1
  1. rcs/
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