cpu/stm32: Fix ifdefs in periph_gpio_ll

[Enoch247]

Contribution description

From the commit msgs:

   cpu/stm32/gpio_ll: make style consistent

   This block of code inconsistently made use of else-if statments. The
   patch makes the use consistent. The change also makes the code a bit
   simpler to read.

    cpu/stm32/gpio_ll: fix ifdef
    
    APB12 is never defined as a macro. It is an element in the bus_t enum.
    Therefore, the test to check if it is defined will always fail.
    
    APB12 is not a real bus. It is the second register of the APB1 bus. I am
    not aware of any STM32 family where the ABP2 bus is implmented (ie
    RCC_APB2ENR_SYSCFGEN is defined) and devices attached to said bus are
    enabled via the APB1 second register. For this reason, the fix is to
    simply remove the check.

Testing procedure

I ensured I did not break the build by doing make -C tests/periph/gpio_ll/ BOARD=nucleo-f767zi. I did not actually run the test, as am not very familiar with the actual driver.

Issues/PRs references

none known

[maribu]

Thx for the fix! ❤️

[riot-ci]

Murdock results

✔️ PASSED

aef5dfe cpu/stm32/gpio_ll: make style consistent

Success	Failures	Total	Runtime
10026	0	10027	10m:08s

Artifacts

• Documentation preview