Bump `stm32f4xx-hal` version to 0.17

[charlesbmi]

Updates the function calls according to the stm32f4xx-hal API changes.

Tested by building all examples, as well as running the following examples on-device:

• gpio_hal_blinky
• mems

I checked that the behavior of these examples matched the behavior when running cargo embed on master.

I also fixed an issue where the mems example uses the incorrect LEDs. Based on my local testing, the mapping should be:

• x>0: red
• x<0: green
• y>0: orange
• y<0: blue Note: I have a STM32F407G-DISC1 board, which is the same currently linked in the README.md. The gpio_hal_blinky LED order looks good to me.

[burrbull]

and squash commits

[charlesbmi]

Squashed the version-bump commits, left the fix-LED as a separate commit since it is logically separate; should I squash that as well?