See #13550

Co-Authored-By: DrDitto <drditto@users.noreply.github.com>

Suggested by https://github.com/MarlinFirmware/Marlin/issues/14742#issuecomment-515753814

Arduino doesn't (always) support `float` formatting in strings. So either cast to `int` or use `dtostrf()` to fix these usages.

- Avoid white flash on TFT (re)init. Unlike Graphical LCD, the TFT init color may be full white if the backlight is on during init.

- Add a conditional for delayed backlight init which can be applied to any backlit display.

Co-Authored-By: alexscarbro <alexscarbro@users.noreply.github.com>

Co-Authored-By: alexscarbro <alexscarbro@users.noreply.github.com>

- init the led pin as output (like other HALs)
- reduce sdio dma priority to normal.. highest is never the best...
- allow fsmc only on compatible STM32F1 (like HAL fsmc)
- fsmc: remove an useless C style cast