libcamera: transform: Make the transformFromOrientation() function static

Now that the transformFromOrientation() function isn't used outside of
transform.cpp, make it static to remove it from the public API.

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

include/libcamera/transform.h

@@ -71,7 +71,6 @@ constexpr Transform operator~(Transform t)
 }
 
 Transform transformFromRotation(int angle, bool *success = nullptr);
-Transform transformFromOrientation(const Orientation &orientation);
 
 Transform operator/(const Orientation &o1, const Orientation &o2);
 Orientation operator*(const Orientation &o, const Transform &t);