Merge "Add mock modem service operations in Telephony" am: d85eecf43e am: 554801476f am: c944f07f1d

Original change: https://android-review.googlesource.com/c/platform/packages/services/Telephony/+/1927025

Change-Id: I3091957e83480b26b3909ab3c5d4bdd4e7427de6