dix: pixmap sharing infrastructure (v3)

This is a hooks for pixmap sharing and tracking.

The pixmap sharing ones get an integer handle for the pixmap
and use a handle to be the backing for a pixmap.

The tracker interface is to be used when a GPU needs to
track pixmaps to be updated for another GPU.

v2: pass slave to sharing so it can use it to work out driver.

v3: use void * as per keithp's suggestion.

Reviewed-by: Keith Packard <keithp@keithp.com>
Reviewed-by: Adam Jackson <ajax@redhat.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

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