Add a loop rate notch to take out shot noise from harmonic notch updates

[andyp1per]

[Hwurzburg]

another .5K in plane

[andyp1per]

That's surprising as the code changes are very small. I would expect a memory bump, but not really a flash bump

[andyp1per]

Was able to make some changes to cut this down. Don't know why it's more expensive on plane.