media: renesas: vsp1: Replace vsp1_partition_window with v4l2_rect

The vsp1_partition_window structure is used to store the horizontal size
of a partition window. This is all that is currently needed, as all
partitions span the whole image vertically. The horizontal window size
is retrieved in the .configure_partition() handler from the
vsp1_partition_window structure, and the vertical window size from the
subdev state.

Accessing the subdev state in the .configure_partition() handler is
problematic in the context of moving to the V4L2 subdev active state
API, as .configure_partition() is called in non-interruptable context,
and the state lock can't be taken. To avoid this, start by storing the
vertical size in the window, replacing the custom vsp1_partition_window
structure with a v4l2_rect. Retrieving the vertical size from the window
in .configure_partition() will be done in a subsequent change.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo.mondi+renesas@ideasonboard.com>

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