drm/sun4i: framebuffer: Set mode_config.normalize_zpos

Back when support for zpos was added in commit 47a05f4a68f9 ("drm/sun4i:
backend: Add support for zpos"), a custom atomic_check callback was also
added in commit b8f1230dd3bf ("drm/sun4i: framebuffer: Add a custom
atomic_check") to have a place to call drm_atomic_normalize_zpos().

Commit 49efffc7fbd4 ("drm: Add drm_mode_config->normalize_zpos boolean")
added drm_atomic_normalize_zpos() to the standard atomic_check function.

Set mode_config.normalize_zpos and drop the custom atomic_check
implementation, which at this point is just a simplified copy of the
standard one. The standard one also checks whether async updates are
valid and updates the self refresh state, but neither feature is
supported by this driver.

Acked-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Link: https://patch.msgid.link/20260803111319.2836240-1-wenst@chromium.org
Signed-off-by: Chen-Yu Tsai <wenst@chromium.org>

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