stm32: stm32g0/h7 usb_dfu_bootloader support (#5596)

Signed-off-by: Alan.Ma from BigTreeTech <tech@biqu3d.com>

src/stm32/stm32g0.c

@@ -147,7 +147,6 @@ usb_request_bootloader(void)
 void
 armcm_main(void)
 {
-    check_usb_dfu_bootloader();
     SCB->VTOR = (uint32_t)VectorTable;
 
     // Reset clock registers (in case bootloader has changed them)
@@ -164,6 +163,8 @@ armcm_main(void)
     RCC->APBENR1 = 0x00000000;
     RCC->APBENR2 = 0x00000000;
 
+    check_usb_dfu_bootloader();
+
     // Set flash latency
     FLASH->ACR = (2<<FLASH_ACR_LATENCY_Pos) | FLASH_ACR_ICEN | FLASH_ACR_PRFTEN;