Retrieve repo snapshot info from Nugget OS

This adds a Nugget OS command to fetch the repo snapshot used to
build the running image.

BUG: 77160892

Change-Id: I5f5078ad124e2d392ea3ddf5a3747c38abf68067
Signed-off-by: Bill Richardson <wfrichar@google.com>
diff --git a/nugget/include/app_nugget.h b/nugget/include/app_nugget.h
index c6d6b07..669e82c 100644
--- a/nugget/include/app_nugget.h
+++ b/nugget/include/app_nugget.h
@@ -221,6 +221,18 @@
  * @errors             APP_ERROR_TOO_MUCH
  */
 
+#define NUGGET_PARAM_REPO_SNAPSHOT 0x000c
+/*
+ * Return the multi-line repo snapshot info for the current image
+ *
+ * @param args         <none>
+ * @param arg_len      0
+ * @param reply        Null-terminated ASCII string
+ * @param reply_len    Max length to return
+ *
+ * @errors             APP_ERROR_TOO_MUCH
+ */
+
 /****************************************************************************/
 /* Test related commands */