Update clang version to 2690385

Matches changes in I1226f24b50319e321ea538362b2f26fcd227ca39

Change-Id: Iecb2c7388d91fe9975dbe035b5ce6fec8d32a435
diff --git a/cc/cc.go b/cc/cc.go
index 4105811..33fc01e 100644
--- a/cc/cc.go
+++ b/cc/cc.go
@@ -164,7 +164,7 @@
 		if override := config.(common.Config).Getenv("LLVM_PREBUILTS_VERSION"); override != "" {
 			return override, nil
 		}
-		return "clang-2658975", nil
+		return "clang-2690385", nil
 	})
 	pctx.StaticVariable("clangPath", "${clangBase}/${HostPrebuiltTag}/${clangVersion}/bin")
 }