T8 ECU stops rensponding if we send bootloader frames to quickly

[witoldo7]

I faced issue if I try to send frames too quickly. I guess inner frame latency shall be applied between frames.
For me T8ECU will respond if I apply 70us delay,

legion.go:132 -> time.Sleep(time.Microsecond * 70)

[witoldo7]

fixed in c508b4f