Add a new so_seek member to "struct file" such that we can have seekable

files that aren't vnodes.  Move the vnode-specific code into its own
function.  Add an implementation for the "DMA buffers" that can be used
by DRI3/prime code to find out the size of the graphics buffer.
This implementation is very limited and only supports offset 0 and only
for SEEK_SET and SEEK_END.  This doesn't really make sense; implementing
stat(2) would be a more obvious choice.  But this is what Linux does.

ok guenther@, visa@

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