Support multi SIM config change in CarrierConfigLoader am: 8f16f3e21d

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/services/Telephony/+/17776088

Change-Id: I6b30dabdc100d190b394848cc7a7ff5e13fbafb2
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>