drm: Use idr_init_base(1) when using id==0 for invalid

Use the new idr_init_base() function to create an IDR that knows id==0
is never allocated as it maps to an invalid identifier. By knowing that
id==0 is invalid, the IDR can start from id=1 instead avoiding the issue
of having to start each lookup from the zeroth leaf as id==0 is always
unused (and thus the tree-of-bitmaps indicate that is the first
available).

References: 6ce711f27500 ("idr: Make 1-based IDRs more efficient")
Signed-off-by: Chris Wilson <[email protected]>
Cc: Daniel Vetter <[email protected]>
Cc: Christian Konig <[email protected]>
Cc: Dave Airlie <[email protected]>
Reviewed-by: Ville Syrjälä <[email protected]>
Acked-by: Christian König <[email protected]> as well.
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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