drm/i915/ttm: Reorganize the ttm move code somewhat

In order to make the code a bit more readable and to facilitate
async memcpy moves, reorganize the move code a little. Determine
at an early stage whether to copy or to clear.

v2:
- Don't set up the memcpy iterators unless we are actually going to memcpy.

Signed-off-by: Thomas Hellström <[email protected]>
Reviewed-by: Matthew Auld <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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