Restart video when mode detection is failed

KVM sometimes stops when video mode is changed. This commit adds
video restarting logic for the case.

Tested:
  1. Open BMCWeb -> Server control -> KVM
  2. Checked KVM screen update while restarting the host. It
     updates all frames even when video mode changes happen.

Change-Id: If986394110986e49a6eaac1ae2859208fa7681f5
Signed-off-by: Jae Hyun Yoo <jae.hyun.yoo@linux.intel.com>
diff --git a/ikvm_video.hpp b/ikvm_video.hpp
index 0e5f3af..faaa57d 100644
--- a/ikvm_video.hpp
+++ b/ikvm_video.hpp
@@ -50,6 +50,12 @@
     void start();
     /* @brief Stops streaming from the video device */
     void stop();
+    /* @brief Restarts streaming from the video device */
+    void restart()
+    {
+        stop();
+        start();
+    }
 
     /*
      * @brief Gets the desired video frame rate in frames per second