Store crashing process name in sysprop

As part of Watchdog-triggered rollback logging, it would
be useful to know the service which has caused
updatable_crashing to be set. Store this in a new property
sys.init.updatable_crashing_process_name.

Test: manual
Bug: 138782888
Change-Id: Iffa38b2b746abbb5d823a8d69b7b8d2456836f4e

init/service.cpp

@@ -326,6 +326,7 @@ void Service::Reap(const siginfo_t& siginfo) {
                                << (boot_completed ? "in 4 minutes" : "before boot completed");
                     // Notifies update_verifier and apexd
                     SetProperty("sys.init.updatable_crashing", "1");
+                    SetProperty("sys.init.updatable_crashing_process_name", name_);
                 }
             }
         } else {