nvflinger: Add toggle to disable buffer swap interval limits

Enabling this setting will allow some titles to present more frames to
the screen as they become available in the nvflinger buffer queue.

src/common/settings.h

@@ -149,6 +149,7 @@ struct Values {
     Setting<bool> use_nvdec_emulation;
     Setting<bool> accelerate_astc;
     Setting<bool> use_vsync;
+    Setting<bool> disable_fps_limit;
     Setting<bool> use_assembly_shaders;
     Setting<bool> use_asynchronous_shaders;
     Setting<bool> use_fast_gpu_time;