drm_hwcomposer: Set requires_modeset() to false after modeset

Reset requires_modeset on a crtc once the initial modeset is
completed. Without this, we'll just do modesets instead of flips.

Change-Id: I998914c914ccb97346ed194a993c703f387bf93b
Signed-off-by: Sean Paul <seanpaul@chromium.org>
diff --git a/hwcomposer.cpp b/hwcomposer.cpp
index 891955d..c9452b6 100644
--- a/hwcomposer.cpp
+++ b/hwcomposer.cpp
@@ -279,6 +279,7 @@
       ALOGE("Modeset failed for crtc %d", crtc->id());
       return ret;
     }
+    crtc->set_requires_modeset(false);
     return 0;
   }