drm/hibmc: Use drm_atomic_helper_check_plane_state()

Call drm_atomic_helper_check_plane_state() from the primary plane's
atomic-check helper and replace the custom implementation.

All plane's implementations of atomic_check should call the shared
_check_plane_state() helper first. It adjusts the plane state for
correct positioning, rotation and scaling of the plane. Do this
even if the plane's CRTC has been disabled by setting the parameter
can_update_disabled. The original code returned early in this case,
but it's safe to so and cleaner to have all plane state initialized.

As we don't set can_position, drm_atomic_helper_check_plane_state()'s
visibility check tests if the plane covers all of the CRTC. This is
a small change from the original code, which tested if the plane is
exactly the size of the CRTC. With the new test, the plane still has
to cover all of the CRTC, but can be larger than the CRTC's size. A
later patch can fully implement this feature in hibmc.

If the plane is disabled, the helper clears the visibility flag in the
plane state. On errors or if the plane is not visible, the atomic-check
helper can return early. Implement all this in hibmc and drop the custom
code that does some of it.

v2:
- extend the commit description (Yongbang)

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Fixes: da52605eea8f ("drm/hisilicon/hibmc: Add support for display engine")
Reviewed-by: Yongbang Shi <shiyongbang@huawei.com>
Cc: Rongrong Zou <zourongrong@gmail.com>
Cc: Sean Paul <seanpaul@chromium.org>
Cc: Xinliang Liu <xinliang.liu@linaro.org>
Cc: Dmitry Baryshkov <lumag@kernel.org>
Cc: Baihan Li <libaihan@huawei.com>
Cc: Yongbang Shi <shiyongbang@huawei.com>
Cc: <stable@vger.kernel.org> # v4.10+
Link: https://patch.msgid.link/20260618123142.92298-2-tzimmermann@suse.de

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