[chirp_devel] Update to TYT TH-UV8000 Driver

[Jim Unroe]

> Please do the same for the Anytone.py file and increase the UHF freq to
> 520 Mhz.
>
> On 7/17/2019 6:47 PM, Rick DeWitt AA0RD via chirp_devel wrote:
> > Users found an issue with tuning steps errors.
> > I had to enable "rf.has_nostep_tuning" to allow frequency multiples of
> > 2k or less.

I was going to do the anytone.py but the radio doesn't work the same
way as the other radios I've dealt with. The radio doesn't store the
whole frequency.

For example the following frequencies require a 6.25 KHz step.

PMR 01: 446.006250
PMR 02: 446.018750

They are displayed in the radio as shown above. But they are stored in
the radio as.

PMR 01: 446.0062
PMR 02: 446.0187

The radio apparently knows it needs to pad the display with 50 Hz when
the frequency in memory ends with 200 Hz or 700 Hz. CHIRP needs to be
able to do the same sort of padding. I wasn't smart enough to figure
out how to do that myself.

Jim KC9HI