[chirp_devel] [PATCH][KT8900R] Initial support for the QYT KT8900R, fixes #3547

This radio is like the BTECH UV-2501+220 but it has the 220 band in the Chinese area (240-270 Mhz) well outside the USA ham band.

This is the initial support patch for this radio, it may need further work on the settings part.