Merge "Perform validation on SignalStrengthUpdateRequest" am: 09c38509a0

Original change: https://android-review.googlesource.com/c/platform/packages/services/Telephony/+/1545044

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: Ieaf801ac13667fb994b7e2206e7fbde6bbafb5b7