Add Beaglebone Black revision D

Adafruit Platform Detect is missing Beaglebone Black rev D boards id

Author: pszafer

adafruit_platformdetect/constants/boards.py

@@ -599,6 +599,7 @@
         ("B", "A335BNLT000B"),
         ("C", "A335BNLT000C"),
         ("C", "A335BNLT00C0"),
+        ("D", "A335BNLT00D0"),
     ),
     BEAGLEBONE_BLUE: (("A2", "A335BNLTBLA2"),),
     BEAGLEBONE_BLACK_WIRELESS: (("A5", "A335BNLTBWA5"),),