[Keyboard] Support flashing Instant60 from command line (#6625)

keyboards/cannonkeys/instant60/rules.mk

@@ -31,6 +31,10 @@ ARMV = 6
 #   <tmk_dir>/tmk_core/tool/chibios/ch-bootloader-jump.patch
 #STM32_BOOTLOADER_ADDRESS = 0x1FFFC800
 
+# Options to pass to dfu-util when flashing
+DFU_ARGS = -d 0483:df11 -a 0 -s 0x08000000:leave
+DFU_SUFFIX_ARGS = -p DF11 -v 0483
+
 # Build Options
 #   comment out to disable the options.
 #