drm/simple-kms: Standardize arguments for callbacks

Passing the wrong type feels icky, everywhere else we use the pipe as
the first parameter. Spotted while discussing patches with Thomas
Zimmermann.

v2: Make xen compile correctly

Acked-By: Thomas Zimmermann <[email protected]> (v1)
Cc: Thomas Zimmermann <[email protected]>
Cc: Noralf Trønnes <[email protected]>
Cc: Gerd Hoffmann <[email protected]>
Cc: Eric Anholt <[email protected]>
Cc: Emil Velikov <[email protected]>
Cc: [email protected]
Cc: Linus Walleij <[email protected]>
Reviewed-by: Linus Walleij <[email protected]>
Signed-off-by: Daniel Vetter <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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