fs/opendingux: Use tabs in fstab

Also removed redundant "defaults" for a fs that had other options.
fs/opendingux: Mount debugfs on boot

We don't enable debugfs by default in our kernel, but if it's enabled
it is convenient to automatically mount it.
SDL: Add patch to match our kernel that waits for vsync on the pan ioctl

This is more reliable than having SDL do the panning after vsync, since
there is very little time between vsync and start-of-frame and if there
is any other thread running it's possible we won't get the CPU in time.