libcamera: Add transpose() function to size

Add a transpose() function to size that applies the
Transformation::Transpose operation in the size. This is useful when
handling orientation adjustments.

Signed-off-by: Stefan Klug <stefan.klug@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

include/libcamera/geometry.h

@@ -108,6 +108,12 @@ public:
 		return *this;
 	}
 
+	Size &transpose()
+	{
+		std::swap(width, height);
+		return *this;
+	}
+
 	[[nodiscard]] constexpr Size alignedDownTo(unsigned int hAlignment,
 						   unsigned int vAlignment) const
 	{