STM32F1: various small changes

- 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

Marlin/src/HAL/HAL_STM32F1/watchdog_STM32F1.cpp

@@ -34,7 +34,7 @@
 #include "watchdog_STM32F1.h"
 
 void watchdog_reset() {
-  #if PIN_EXISTS(LED)
+  #if DISABLED(PINS_DEBUGGING) && PIN_EXISTS(LED)
     TOGGLE(LED_PIN);  // heartbeat indicator
   #endif
   iwdg_feed();