drm/hibmc: Set up vblank event to be send on the next vblank

Do not send the vblank event when the page flip completes, but when
the vblank interrupt fires. Sending the vblank event at the wrong time
can break synchronization of the display update with the vblank period.

Use the vblank helper drm_crtc_vblank_atomic_flush(), which sets up
the vblank event accordingly. In case of an error, it still sends out
the vblank event immediately; thus not starving consumers.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Yongbang Shi <shiyongbang@huawei.com>
Link: https://patch.msgid.link/20260827082915.61176-3-tzimmermann@suse.de

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