Add other default and TTN Community Network frequency plans

[htdvisser]

This PR adds the following default frequency plans:

• AU_915_928 FSB1
• US_902_928 FSB1
• IN_865_867

and the following frequency plans from the Public Community Network:

• EU_863_870 with Rx2 at SF9BW125
• AU_915_928 FSB2
• US_902_928 FSB2
• CN_470_510 FSB11
• AS_920_923 (with and without LBT)
• AS_923_925 (with and without LBT)
• KR_920_923
• RU_864_870