icE1usb fw: Limit dfuprog to proper USB IDs

Signed-off-by: Sylvain Munaut <tnt@246tNt.com>
Change-Id: Iaf96565b4068c2d6aa46d8bedac1fad618130a26
diff --git a/firmware/ice40-riscv/icE1usb/Makefile b/firmware/ice40-riscv/icE1usb/Makefile
index b05a532..3fde2ca 100644
--- a/firmware/ice40-riscv/icE1usb/Makefile
+++ b/firmware/ice40-riscv/icE1usb/Makefile
@@ -101,7 +101,7 @@
 	$(ICEPROG) -o 640k $<
 
 dfuprog: $(GITVER).bin
-	$(DFU_UTIL) -R -a 1 -D $<
+	$(DFU_UTIL) -R -d 1d50:6145,1d50:6144 -a 1 -D $<
 
 
 clean: