Go to nap when receiving <Active Source> for the other devices.

- Previously, it went to sleep when it got <Active Source>, but this
  causes the other side-effects like can't-wake-up when changing to HDMI
  port directly.

Bug: 15578870
Change-Id: I0ca5bd2372c9e5e7446592d66483900eeba75500

services/core/java/com/android/server/hdmi/HdmiCecLocalDevicePlayback.java

@@ -140,7 +140,7 @@ final class HdmiCecLocalDevicePlayback extends HdmiCecLocalDevice {
         if (physicalAddress != mService.getPhysicalAddress()) {
             mIsActiveSource = false;
             if (mService.isPowerOnOrTransient()) {
-                mService.standby();
+                mService.nap();
             }
             return true;
         }

services/core/java/com/android/server/hdmi/HdmiControlService.java

@@ -1451,6 +1451,11 @@ public final class HdmiControlService extends SystemService {
         // the intent, the sequence will continue at onStandby().
     }
 
+    void nap() {
+        PowerManager pm = (PowerManager) getContext().getSystemService(Context.POWER_SERVICE);
+        pm.nap(SystemClock.uptimeMillis());
+    }
+
     @ServiceThreadOnly
     private void onWakeUp() {
         assertRunOnServiceThread();