Import final sdk version 31 from build 7432250

Bug: 171506470
Test: m checkapi
Change-Id: I5d822c04512ec5582802b15134a47b637dd67b9b
diff --git a/Android.bp b/Android.bp
index 66fbe7a..b17fef3 100644
--- a/Android.bp
+++ b/Android.bp
@@ -130,6 +130,7 @@
         "28",
         "29",
         "30",
+        "31",
         "current",
     ],
     next_api_dir: "31",