libcamera: framebuffer: Replace vector with span in constructor

The FrameBuffer constructor takes a list of planes as an std::vector.
The caller may stores the planes in a different type of container,
resulting in the needless allocation of a temporary vector. Replace it
with a span.

Suggested-by: Daniel Rákos <daniel.rakos@rastergrid.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Barnabás Pőcze <barnabas.pocze@ideasonboard.com>

src/android/mm/cros_frame_buffer_allocator.cpp

@@ -29,7 +29,7 @@ class CrosFrameBufferData : public FrameBuffer::Private
 
 public:
 	CrosFrameBufferData(cros::ScopedBufferHandle scopedHandle,
-			    const std::vector<FrameBuffer::Plane> &planes)
+			    Span<const FrameBuffer::Plane> planes)
 		: FrameBuffer::Private(planes), scopedHandle_(std::move(scopedHandle))
 	{
 	}

src/android/mm/generic_frame_buffer_allocator.cpp

@@ -35,7 +35,7 @@ class GenericFrameBufferData : public FrameBuffer::Private
 public:
 	GenericFrameBufferData(struct alloc_device_t *allocDevice,
 			       buffer_handle_t handle,
-			       const std::vector<FrameBuffer::Plane> &planes)
+			       Span<const FrameBuffer::Plane> planes)
 		: FrameBuffer::Private(planes), allocDevice_(allocDevice),
 		  handle_(handle)
 	{