Re: [RFCv4,10/35] lib/ukbus: Adjust default bus register priority

[Razvan Virtan <virtanrazvan@xxxxxxxxx>]

Hi, Justin.
In `ctors.h` the `UK_CTOR_FUNC` macro is marked as
`/* DELETEME: Compatibility wrapper for existing code, to be removed! */`.

Therefore, I think we could change the definition of `_UK_BUS_REGISTER_CTOR` 
from

```#define _UK_BUS_REGISTER_CTOR(CTOR, prio)  \
        UK_CTOR_FUNC(prio, CTOR)```

to

```#define _UK_BUS_REGISTER_CTOR(CTOR, prio)  \
        UK_CTOR_PRIO(CTOR, prio)```

Reviewed-by: Razvan Virtan <virtanrazvan@xxxxxxxxx>