Implement DELAY_NS with CYCCNT on Cortex-M7 (#12283)

Marlin/src/HAL/HAL_STM32/HAL.cpp

@@ -30,6 +30,7 @@
 #include "HAL.h"
 
 #include "../../inc/MarlinConfig.h"
+#include "../shared/Delay.h"
 
 #if ENABLED(EEPROM_EMULATED_WITH_SRAM)
   #if STM32F7xx
@@ -80,6 +81,11 @@ uint16_t HAL_adc_result;
 // HAL initialization task
 void HAL_init(void) {
 
+  // Needed for DELAY_NS() / DELAY_US() on CORTEX-M7
+  #if (defined(__arm__) || defined(__thumb__)) && __CORTEX_M == 7
+    enableCycleCounter();
+  #endif
+
   FastIO_init();
 
   #if ENABLED(SDSUPPORT)