Ensure ICC_ERROR generates a description in the disconnect cause. am: a00601a191

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/services/Telephony/+/19271386

Change-Id: I9713de4e795b1b28625ea4af6c9bbf9040f56302
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>