drm/rcar-du: Convert to atomic_create_state

The rcar-du crtc implementation provides a custom reset hook. However,
this hook only allocates the state, initializes it with
__drm_atomic_helper_crtc_reset(), sets driver-specific default values
for the CRC source and index, and frees the previous state. It does
not perform any hardware reset.

Since this is exactly what the atomic_create_state hook is meant to
do, minus the old state cleanup which the caller handles, convert the
implementation to use atomic_create_state with
__drm_atomic_helper_crtc_state_init() instead.

Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://patch.msgid.link/20260821-drm-no-more-crtc-reset-v1-59-fb793475c05a@kernel.org
Signed-off-by: Maxime Ripard <mripard@kernel.org>

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