Both VESA and Intel GPU drivers legitimately do not support
hardware cursor planes. The handle_cursor method should be
a no-op (software cursor is handled by the console layer),
not a panic.
Replaced unimplemented!() with documented no-ops explaining
that cursor rendering is handled by the software console layer.
This matches Linux 7.1 behavior where framebuffer drivers
defer cursor rendering to the VT/console subsystem.
Red Bear OS