stm32/mboot: Only compile in code for the USB periph that is being used.

Prior to this patch, if both USB FS and HS were enabled via the
configuration file then code was included to handle both of their IRQs.
But mboot only supports listening on a single USB peripheral, so this patch
excludes the code for the USB that is not used.

ports/stm32/mboot/main.c

@@ -58,9 +58,9 @@
 
 // Work out which USB device to use for the USB DFU interface
 #if !defined(MICROPY_HW_USB_MAIN_DEV)
-#if defined(MICROPY_HW_USB_FS)
+#if MICROPY_HW_USB_FS
 #define MICROPY_HW_USB_MAIN_DEV (USB_PHY_FS_ID)
-#elif defined(MICROPY_HW_USB_HS) && defined(MICROPY_HW_USB_HS_IN_FS)
+#elif MICROPY_HW_USB_HS && MICROPY_HW_USB_HS_IN_FS
 #define MICROPY_HW_USB_MAIN_DEV (USB_PHY_HS_ID)
 #else
 #error Unable to determine proper MICROPY_HW_USB_MAIN_DEV to use
@@ -846,10 +846,8 @@ static int dfu_handle_tx(int cmd, int arg, int len, uint8_t *buf, int max_len) {
 
 #define USB_XFER_SIZE (DFU_XFER_SIZE)
 
-enum {
-    USB_PHY_FS_ID = 0,
-    USB_PHY_HS_ID = 1,
-};
+#define USB_PHY_FS_ID (0)
+#define USB_PHY_HS_ID (1)
 
 typedef struct _pyb_usbdd_obj_t {
     bool started;
@@ -1248,12 +1246,11 @@ enter_bootloader:
     #endif
     for (;;) {
         #if USE_USB_POLLING
-        #if defined(MICROPY_HW_USB_FS)
+        #if MICROPY_HW_USB_MAIN_DEV == USB_PHY_FS_ID
         if (USB_OTG_FS->GINTSTS & USB_OTG_FS->GINTMSK) {
             HAL_PCD_IRQHandler(&pcd_fs_handle);
         }
-        #endif
-        #if defined(MICROPY_HW_USB_HS)
+        #else
         if (USB_OTG_HS->GINTSTS & USB_OTG_HS->GINTMSK) {
             HAL_PCD_IRQHandler(&pcd_hs_handle);
         }
@@ -1328,12 +1325,11 @@ void I2Cx_EV_IRQHandler(void) {
 #endif
 
 #if !USE_USB_POLLING
-#if defined(MICROPY_HW_USB_FS)
+#if MICROPY_HW_USB_MAIN_DEV == USB_PHY_FS_ID
 void OTG_FS_IRQHandler(void) {
     HAL_PCD_IRQHandler(&pcd_fs_handle);
 }
-#endif
-#if defined(MICROPY_HW_USB_HS)
+#else
 void OTG_HS_IRQHandler(void) {
     HAL_PCD_IRQHandler(&pcd_hs_handle);
 }