F4: fix HID upload with Arduino IDE

Author: stevstrong

STM32F4/boards.txt

@@ -110,6 +110,7 @@ generic_f407v.menu.upload_method.STLinkMethod.upload.dfuse_addr=0x08004000
 generic_f407v.menu.upload_method.STLinkMethod.build.vect_flags=-DVECT_TAB_FLASH -DUSER_ADDR_ROM=(uint32)0x08000000
 
 generic_f407v.menu.upload_method.HIDUploadMethod=HID bootloader 2.0
+generic_f407v.menu.upload_method.HIDUploadMethod.upload.protocol=hid_boot
 generic_f407v.menu.upload_method.HIDUploadMethod.upload.tool=hid_upload
 generic_f407v.menu.upload_method.HIDUploadMethod.build.vect_flags=-DVECT_TAB_FLASH -DUSER_ADDR_ROM=(uint32)0x08004000 -DVECT_TAB_OFFSET=0x4000
 generic_f407v.menu.upload_method.HIDUploadMethod.build.ldscript=ld/bootloader_8004000.ld