Fixed a race condition for early arrived PCO data am: 315bc648

Original change: https://android-review.googlesource.com/c/platform/frameworks/opt/telephony/+/2193806



Change-Id: I3ed479f84657f9aee9b1c5ff1d454bf4e24cf02f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>