Cleanup rules.mk for 32U4 keyboards, G (#6971)

* Cleanup rules.mk for 32U4 keyboards, G

* Update keyboards/gray_studio/cod67/rules.mk

keyboards/georgi/rules.mk

@@ -1,18 +1,15 @@
-#----------------------------------------------------------------------------
-# make georgi:default:dfu
-# Make sure you have dfu-programmer installed!
-# Do not edit this file! Make a copy of keymaps/default and modify that!
-#----------------------------------------------------------------------------
-# Source includes
-SRC += matrix.c i2c_master.c sten.c
-
-# Hardware info
+# MCU name
 MCU = atmega32u4
-F_CPU = 16000000
-ARCH = AVR8
+
+# Bootloader selection
+#   Teensy       halfkay
+#   Pro Micro    caterina
+#   Atmel DFU    atmel-dfu
+#   LUFA DFU     lufa-dfu
+#   QMK DFU      qmk-dfu
+#   ATmega32A    bootloadHID
+#   ATmega328P   USBasp
 BOOTLOADER = atmel-dfu
-F_USB = $(F_CPU)
-EXTRAFLAGS += -flto
 
 CUSTOM_MATRIX 		= yes
 MOUSEKEY_ENABLE		= no
@@ -21,3 +18,6 @@ EXTRAKEY_ENABLE     = yes
 CONSOLE_ENABLE      = yes
 COMMAND_ENABLE      = no
 NKRO_ENABLE			= yes
+
+EXTRAFLAGS += -flto
+SRC += matrix.c i2c_master.c sten.c