libcamera: framebuffer: Allocate metadata planes at construction time

The metadata planes are allocated by V4L2VideoDevice when dequeuing a
buffer. This causes the metadata planes to only be allocated after a
buffer gets dequeued, and doesn't provide any strong guarantee that
their number matches the number of FrameBuffer planes. The lack of this
invariant makes the FrameBuffer class fragile.

As a first step towards fixing this, allocate the metadata planes when
the FrameBuffer is constructed. The FrameMetadata API should be further
improved by preventing a change in the number of planes.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com>
Reviewed-by: Hirokazu Honda <hiroh@chromium.org>

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