drm/ttm: prevent moving of pinned BOs

We have checks for this in the individual drivers move callback, but
it's probably better to generally forbid that on a higher level.

Also stops exporting ttm_resource_compat() since that's not necessary
any more after removing the extra checks in vmwgfx.

Signed-off-by: Christian König <[email protected]>
Reviewed-by: Matthew Auld <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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