tinyusb/dfu: Fix build when auto confirm is off

Part of the code and data was included only if
USBD_DFU_RESET_AFTER_DOWNLOAD was set.

While package init function used those functions and data
regardless of syscfg value.

package init function is not called from sysinit when
USBD_DFU_RESET_AFTER_DOWNLOAD is not set but code inside is
still there.

Now all code is there and if functionality is not used
package init function will not be called from sysinit.

hw/usb/tinyusb/dfu/src/dfu.c

@@ -33,8 +33,6 @@
  */
 #define FIRMWARE_SLOT       MYNEWT_VAL(USBD_DFU_SLOT_ID)
 
-#if MYNEWT_VAL(USBD_DFU_RESET_AFTER_DOWNLOAD)
-
 struct os_callout delayed_reset_callout;
 struct os_callout auto_confirm_callout;
 
@@ -44,8 +42,6 @@ delayed_reset_cb(struct os_event *event)
     hal_system_reset();
 }
 
-#endif
-
 /*
  * DFU callbacks
  * Note: alt is used as the partition number, in order to support multiple partitions like FLASH, EEPROM, etc.