stm32: define hard pwm PB pins for stm32g4

[nefelim4ag]

PB6 used on Cartographer v4

Need a test on the actual board

Thanks,
-Timofey

---

https://klipper.discourse.group/t/cartographer-v3-v4-reverse-engineering/25018/7

cd ~/klipper
git fetch origin pull/7175/head
git checkout FETCH_HEAD
make menuconfig
make flash ...

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