Camera: Flush in-flight requests during device detach

Improve performance during device detach by flushing all
camera requests.

Bug: 80402005
Test: Camera CTS

Change-Id: I3a6864575b1533c77b5478c2390a908892700f6e
Merged-In: I3a6864575b1533c77b5478c2390a908892700f6e

services/camera/libcameraservice/api2/CameraDeviceClient.cpp

@@ -1677,9 +1677,12 @@ void CameraDeviceClient::detachDevice() {
 
     // WORKAROUND: HAL refuses to disconnect while there's streams in flight
     {
-        mDevice->clearStreamingRequest();
-
+        int64_t lastFrameNumber;
         status_t code;
+        if ((code = mDevice->flush(&lastFrameNumber)) != OK) {
+            ALOGE("%s: flush failed with code 0x%x", __FUNCTION__, code);
+        }
+
         if ((code = mDevice->waitUntilDrained()) != OK) {
             ALOGE("%s: waitUntilDrained failed with code 0x%x", __FUNCTION__,
                   code);