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/api1/Camera2Client.cpp b/services/camera/libcameraservice/api1/Camera2Client.cpp
index 09829ea..9b1c947 100644
--- a/services/camera/libcameraservice/api1/Camera2Client.cpp
+++ b/services/camera/libcameraservice/api1/Camera2Client.cpp
@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-#define LOG_TAG "Camera2"
+#define LOG_TAG "Camera2Client"
 #define ATRACE_TAG ATRACE_TAG_CAMERA
 //#define LOG_NDEBUG 0