[PATCH v3 09/10] drm/vc4: Use __drm_atomic_helper_plane_reset instead of copying the logic

Alexandru Gheorghe [off-list ref] writes:

A new helper function(__drm_atomic_helper_plane_reset) has been added
for linking a plane with its state and resetting the core
properties(alpha, rotation, etc.) to their default values.
Use that instead of duplicating the logic.

__drm_atomic_helper_plane_reset initializes the alpha property to its
max value, which is defined by the drm core as DRM_BLEND_ALPHA_OPAQUE,
so nothing changes regarding the alpha value.

Signed-off-by: Alexandru Gheorghe <redacted>

Acked-by: Eric Anholt <redacted>
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