Re-add LED support

This reverts commit 5b069a0104.

kmk/boards/converter/keebio/levinson_r2.py

@@ -0,0 +1,19 @@
+import board
+
+from kmk.consts import DiodeOrientation
+from kmk.mcus.circuitpython_samd51 import Firmware as _Firmware
+from kmk.pins import Pin as P
+
+
+class Firmware(_Firmware):
+    col_pins = (P.A2, P.A3, P.A4, P.A5, P.SCK, P.MOSI)
+    row_pins = (P.D13, P.D11, P.D10, P.D9)
+    diode_orientation = DiodeOrientation.COLUMNS
+
+    split_type = 'UART'
+    split_flip = True
+    split_offsets = [6, 6, 6, 6, 6]
+    uart_pin = board.SCL
+    extra_data_pin = board.SDA
+    rgb_pixel_pin = board.TX
+    # led_pin = board.D7