1052: stm32: Fix watchdog division by zero for 256 prescaler, add watchdog … r=lulf a=matoushybl
…example for H7
The problem is that `2u8.powi(8) == 0`, which causes division by zero.
1053: Disable MMC interrupts r=lulf a=matoushybl
MMC interrupts can cause firmware hangup - refer to: https://github.com/stm32-rs/stm32h7xx-hal/issues/275 for more information
Fixes#594
Co-authored-by: Matous Hybl <hyblmatous@gmail.com>
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