Add back LPCXpresso55S69 board to board database

Added back LPCXpresso55S69 board details to the database.

Author: JohnK1987

tools/python/mbed_tools/targets/_internal/data/board_database_snapshot.json

@@ -1128,6 +1128,21 @@
             "Baseline"
         ]
     },
+    {
+        "board_type": "LPC55S69_NS",
+        "board_name": "LPCXpresso55S69",
+        "product_code": "0236",
+        "target_type": "platform",
+        "slug": "LPCXpresso55S69",
+        "build_variant": [],
+        "mbed_os_support": [
+            "Mbed OS 5.14",
+            "Mbed OS 5.15"
+        ],
+        "mbed_enabled": [
+            "Baseline"
+        ]
+    },
     {
         "board_type": "SDP_K1",
         "board_name": "SDP-K1",