FSMCv1: add STM32G4 FMC register support#442
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Map STM32G4 devices to the existing FMC register compatibility layer and include STM32G4 in the SRAM CCLKEN handling.
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This adds STM32G4 devices with FMC to the existing FSMCv1 compatibility layer.
The change maps STM32G473/G483/G474/G484 devices through the existing FMC base-address compatibility path and includes them in the SRAM CCLKEN handling used when stopping the SRAM driver.
This also needs matching STM32G4/FMC support on the main ChibiOS side, as proposed here:
https://forum.chibios.org/viewtopic.php?t=6698
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