drm/i915: Rename the confusing 'plane_id' to 'color_plane'

A variable whose name is 'plane_id' is expected to be of the
enum plane_id type. In this case we have a raw int, which turns
out to refer to the plane of the framebuffer. Rename the variable
to 'color_plane' in line with the trend started earlier.

Signed-off-by: Ville Syrjälä <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]
Reviewed-by: Matt Roper <[email protected]>
Reviewed-by: Maarten Lankhorst <[email protected]>

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