Make init.updatable_crashing a read/write property

This property will need to be reset during userspace reboot, so it can't
be a read-only property anymore.

Test: builds
Test: atest apex_rollback_tests
Bug: 135984674
Change-Id: I9f5ec10ed31b63642192573139e44d43e726ea9c

services/core/java/com/android/server/rollback/RollbackPackageHealthObserver.java

@@ -370,7 +370,7 @@ public final class RollbackPackageHealthObserver implements PackageHealthObserve
     private void checkAndMitigateNativeCrashes() {
         mNumberOfNativeCrashPollsRemaining--;
         // Check if native watchdog reported a crash
-        if ("1".equals(SystemProperties.get("ro.init.updatable_crashing"))) {
+        if ("1".equals(SystemProperties.get("sys.init.updatable_crashing"))) {
             execute(getModuleMetadataPackage());
             // we stop polling after an attempt to execute rollback, regardless of whether the
             // attempt succeeds or not