QCamera2: set_torch_mode returns -ENOSYS if device doesn't have flash

Test: Compile
Bug: 33811945
Change-Id: I073e10a68d2e86e6c6a312e189952756374ceafb
diff --git a/camera/QCamera2/util/QCameraFlash.cpp b/camera/QCamera2/util/QCameraFlash.cpp
index 2ca8fb4..e5d3c4c 100644
--- a/camera/QCamera2/util/QCameraFlash.cpp
+++ b/camera/QCamera2/util/QCameraFlash.cpp
@@ -156,7 +156,7 @@
         ALOGE("%s: No flash available for camera id: %d",
                 __func__,
                 camera_id);
-        retVal = -EINVAL;
+        retVal = -ENOSYS;
     } else if (m_cameraOpen[camera_id]) {
         ALOGE("%s: Camera in use for camera id: %d",
                 __func__,