stmhal: L4: Make CCM/DTCM RAM start-up conditional on MCU type.

stmhal/main.c

@@ -367,6 +367,7 @@ int main(void) {
     __GPIOC_CLK_ENABLE();
     __GPIOD_CLK_ENABLE();
 
+    #if defined(MCU_SERIES_F4) ||  defined(MCU_SERIES_F7)
         #if defined(__HAL_RCC_DTCMRAMEN_CLK_ENABLE)
         // The STM32F746 doesn't really have CCM memory, but it does have DTCM,
         // which behaves more or less like normal SRAM.
@@ -375,6 +376,7 @@ int main(void) {
         // enable the CCM RAM
         __CCMDATARAMEN_CLK_ENABLE();
         #endif
+    #endif
 
     #if defined(MICROPY_BOARD_EARLY_INIT)
     MICROPY_BOARD_EARLY_INIT();