Is your feature request related to a problem? Please describe.
STM32F1x hal lacks fsmc, i2s, sdio and probably other interfaces.

Describe the solution you'd like
Add dtsi definitions like in higher families

Additional context
I want to port Zephyr to stm32primer 2 board, I'm currently working on board folder, and thinking about adding drivers, but I think hal is not my cup of tea.