Added subscription info conversion method am: 2877221d

Original change: https://android-review.googlesource.com/c/platform/frameworks/opt/telephony/+/2470133



Change-Id: I0dc78fcded7502217f9a21c1caf664fe26f7812e
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>