AP_HAL_ChibiOS: remove setting HAL_USE_UART to false

[peterbarker]

this is the default

Board           AP_Periph
Here4AP         *
Hitec-Airspeed  *
HitecMosaic     *
f103-GPS        *
f303-GPS        *
f303-MatekGPS   *

[tpwrules]

Assuming this is good if CI passes. Always like less lines.

Worth attacking the other related looking ones in the same PR?

• empty SERIAL_ORDER
• define HAL_NO_UARTDRIVER TRUE
• define HAL_USE_SERIAL FALSE

[peterbarker]

Assuming this is good if CI passes. Always like less lines.

Worth attacking the other related looking ones in the same PR?

* empty `SERIAL_ORDER`

* `define HAL_NO_UARTDRIVER TRUE`

* `define HAL_USE_SERIAL FALSE`

Yes, they're worth looking at. The first is likely to be a script problem, just a little but of python work.

I'm working on the second (https://github.com/peterbarker/ardupilot/tree/pr/HAL_NO_UARTDRIVER-usage)

Had a glance at the third earlier today and scratched my head a little...