Camera: Save 1 frame time for takePicture call

Move the latest request signal call right before submitting request to HAL,
which avoids unnecessary 1 frame time wait.

Also fix request status constructor issue, and the log tag for Camera2Client.

Bug: 10570497
Change-Id: I0b1818658bee9983b117e49a5a00f1aab515c567
diff --git a/services/camera/libcameraservice/device3/Camera3Device.h b/services/camera/libcameraservice/device3/Camera3Device.h
index c2b0867..12252c8 100644
--- a/services/camera/libcameraservice/device3/Camera3Device.h
+++ b/services/camera/libcameraservice/device3/Camera3Device.h
@@ -457,6 +457,7 @@
         InFlightRequest(int id, int numBuffers) :
                 requestId(id),
                 captureTimestamp(0),
+                requestStatus(OK),
                 haveResultMetadata(false),
                 numBuffersLeft(numBuffers) {
         }