platform-ststm32
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STM32F446xxx FSMC support
Please add STm32F446xx too all necessary libraries for FSMC support.
Currently the SRAM Hal library cannot be resolved. Which leads to an error during build in marlin.

I found out that this controller is not listed in all libraries.
There is also a alot of other stuff which cannot be resolved due to the STM32F446xxx controller
