sketch out frosty flake matrix using custom matrix.c based on kitten paw

keyboards/frosty_flake/rules.mk

@@ -1,6 +1,6 @@
 # MCU name
 #MCU = at90usb1287
-MCU = atmega32u4
+MCU = atmega32u2
 
 # Processor frequency.
 #     This will define a symbol, F_CPU, in all source code files equal to the
@@ -45,7 +45,7 @@ OPT_DEFS += -DINTERRUPT_CONTROL_ENDPOINT
 #   Atmel DFU loader 4096
 #   LUFA bootloader  4096
 #   USBaspLoader     2048
-OPT_DEFS += -DBOOTLOADER_SIZE=512
+OPT_DEFS += -DBOOTLOADER_SIZE=4096
 
 
 # Build Options
@@ -66,3 +66,6 @@ UNICODE_ENABLE ?= no         # Unicode
 BLUETOOTH_ENABLE ?= no       # Enable Bluetooth with the Adafruit EZ-Key HID
 AUDIO_ENABLE ?= no           # Audio output on port C6
 FAUXCLICKY_ENABLE ?= no      # Use buzzer to emulate clicky switches
+
+CUSTOM_MATRIX = yes
+SRC += matrix.c