[chirp_devel] [New Model] Support for the Kenwood TK-76x/86x non G models, fixes issue #3139

This patch add support for the Kenwood Mobile part of the old "Serie/Family 60", including this radios:

VHF: TK-760/762, all versions, including H models UHF: TK-860/862, all versions, including H models

Only basic common ham settings support by now.