Add sdk_version to the 'libeign' module am: c225319b71

Original change: https://googleplex-android-review.googlesource.com/c/platform/external/eigen/+/14792110

Change-Id: I653950a5f9b2522b3482c672a35d77ac2083881c
diff --git a/Android.bp b/Android.bp
index 23c3280..7376cc8 100644
--- a/Android.bp
+++ b/Android.bp
@@ -79,6 +79,7 @@
         "test_com.android.neuralnetworks",
 	"//apex_available:platform",
     ],
+    sdk_version: "current",
 }
 
 subdirs = ["blas"]