cortexm stm32 invert backup domain protect macros

[Simon Kallweit]

>
>> Thinking about it after having done the checkin, I'm not entirely
>> happy with the naming of CYGHWR_HAL_STM32_BD_UNPROTECT() and 
>> hal_stm32_bd_unprotect(). The un... parts could be a little confusing
>> and the sense of things seems wrong. I would be happier with
>> CYGHWR_HAL_STM32_BD_PROTECT() and hal_stm32_bd_protect() with a
>> matching inversion of the meaning of the argument. It is probably not
>> worth worrying about immediately, but is something that might need to
>> change in the future.
>>   
>
> I see your point, I'll change that tomorrow.

Here is the patch to change CYGHWR_HAL_STM32_BD_UNPROTECT() to 
CYGHWR_HAL_STM32_BD_PROTECT(). I guess this is better done early than later.

Simon
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