Add LUFA mass storage `BOOTLOADER` "support" (#7729)

bootloader.mk

@@ -82,6 +82,13 @@ ifeq ($(strip $(BOOTLOADER)), USBasp)
     OPT_DEFS += -DBOOTLOADER_USBASP
     BOOTLOADER_SIZE = 4096
 endif
+ifeq ($(strip $(BOOTLOADER)), lufa-ms)
+    # DO NOT USE THIS BOOTLOADER IN NEW PROJECTS!
+    # It is extremely prone to bricking, and is only included to support existing boards.
+    OPT_DEFS += -DBOOTLOADER_MS
+    BOOTLOADER_SIZE = 6144
+    FIRMWARE_FORMAT = bin
+endif
 
 ifdef BOOTLOADER_SIZE
     OPT_DEFS += -DBOOTLOADER_SIZE=$(strip $(BOOTLOADER_SIZE))

keyboards/gray_studio/cod67/rules.mk

@@ -9,10 +9,7 @@ MCU = atmega32u4
 #   QMK DFU      qmk-dfu
 #   ATmega32A    bootloadHID
 #   ATmega328P   USBasp
-BOOTLOADER = atmel-dfu # actually lufa-ms
-
-# Mass storage bootloader on the COD67 uses bin files
-FIRMWARE_FORMAT = bin
+BOOTLOADER = lufa-ms
 
 # Build Options
 #   change yes to no to disable

keyboards/tada68/rules.mk

@@ -9,10 +9,7 @@ MCU = atmega32u4
 #   QMK DFU      qmk-dfu
 #   ATmega32A    bootloadHID
 #   ATmega328P   USBasp
-BOOTLOADER = atmel-dfu # actually lufa-ms
-
-# Mass storage bootloader on the tada68 uses bin files
-FIRMWARE_FORMAT = bin
+BOOTLOADER = lufa-ms
 
 # Build Options
 #   comment out to disable the options.