adb: Add "unauthorized" connection state

Add a new connection state, so that devices, that require confirmation
to allow adb, appear as "unauthorized" in the adb devices lists.

Change-Id: Ib4264bc5736dedecf05bcf8e31896f4d7a91fad8
diff --git a/adb/adb.h b/adb/adb.h
index 9da8af8..a01d460 100644
--- a/adb/adb.h
+++ b/adb/adb.h
@@ -468,6 +468,7 @@
 #define CS_RECOVERY   4
 #define CS_NOPERM     5 /* Insufficient permissions to communicate with the device */
 #define CS_SIDELOAD   6
+#define CS_UNAUTHORIZED 7
 
 extern int HOST;
 extern int SHELL_EXIT_NOTIFY_FD;