[chirp_devel] [PATCH][tk-760g.py] Add the Kenwood Serie 60G UHF HTs, fixes #3487

As per an user request, added the following HT for the Kenwood Series 60G:

TK-360G/370G/372G/378G/388G

The band limits are widened, please note the notice in the experimental popup text.

73 Pavel CO7WT