Persistent process should have all capabilities.

By default.

Fix: 149930393
Test: "adb shell dumpsys activity -a", system process record have
curCapability=7.

Change-Id: I9dacaefbb33a6e595044b452dcbfd3b26fc9df2b

services/core/java/com/android/server/am/OomAdjuster.java

@@ -1128,6 +1128,7 @@ public final class OomAdjuster {
             app.setCurRawAdj(app.maxAdj);
             app.setHasForegroundActivities(false);
             app.setCurrentSchedulingGroup(ProcessList.SCHED_GROUP_DEFAULT);
+            app.curCapability = PROCESS_CAPABILITY_ALL;
             app.setCurProcState(ActivityManager.PROCESS_STATE_PERSISTENT);
             // System processes can do UI, and when they do we want to have
             // them trim their memory after the user leaves the UI.  To