Add support for NVIDIA Clara AGX Xavier

Author: nvswarren

adafruit_platformdetect/constants/boards.py

@@ -42,6 +42,7 @@
 # NVIDIA Jetson boards
 JETSON_TX1 = "JETSON_TX1"
 JETSON_TX2 = "JETSON_TX2"
+CLARA_AGX_XAVIER = "CLARA_AGX_XAVIER"
 JETSON_XAVIER = "JETSON_XAVIER"
 JETSON_NANO = "JETSON_NANO"
 JETSON_NX = "JETSON_NX"
@@ -141,6 +142,9 @@
         "nvidia,quill",
         "nvidia,storm",
     )),
+    (CLARA_AGX_XAVIER, (
+        "nvidia,e3900-0000+p2888-0004",
+    )),
     (JETSON_XAVIER, (
         "nvidia,p2972-0000",
         "nvidia,p2972-0006",