profcollect: check hardware capability on a background thread

This is a blocking event, needs to be moved off from the main thread.

Also, don't schedule background processing service if the hardware
has no tracing support.

Test: manual
Bug: 79161490
Bug: 206986559
Change-Id: I039211b26f25ead66cf125f152e794b0c08057ee

services/profcollect/src/com/android/server/profcollect/ProfcollectForwardingService.java

@@ -91,10 +91,12 @@ public final class ProfcollectForwardingService extends SystemService {
             if (mIProfcollect == null) {
                 return;
             }
-            if (serviceHasSupportedTraceProvider()) {
-                registerObservers();
-            }
-            ProfcollectBGJobService.schedule(getContext());
+            BackgroundThread.get().getThreadHandler().post(() -> {
+                if (serviceHasSupportedTraceProvider()) {
+                    registerObservers();
+                    ProfcollectBGJobService.schedule(getContext());
+                }
+            });
         }
     }