build/tools/esp32: Remove dependent for make target "romfs"
if dependent "ROMFS_IMG" image not exist, "No rule to make target"
error will report, and this image will be checked by another script,
so this dependent can be removed.
@@ -80,7 +80,7 @@ OS:app-flash
ROMFS:romfs
-romfs: $(ROMFS_IMG) $(ESPTOOLPY_SRC)
+romfs: $(ESPTOOLPY_SRC)
ifneq ($(ROMFS_OFFSET),-1)
@echo "Flashing romfs image to serial port $(ESPPORT), offset $(ROMFS_OFFSET)..."
$(ESPTOOLPY_WRITE_FLASH) $(ROMFS_OFFSET) $(ROMFS_IMG)
