Add adb_keys symlink to system image

This is missing while migration.

Bug: 370351755
Test: build
Change-Id: I77c6a610705e5b045bcbca89c4fc9d69bbc64fc4
diff --git a/target/product/generic/Android.bp b/target/product/generic/Android.bp
index bf82ff1..c14fa17 100644
--- a/target/product/generic/Android.bp
+++ b/target/product/generic/Android.bp
@@ -72,6 +72,10 @@
         target: "/storage/self/primary",
         name: "sdcard",
     },
+    {
+        target: "/product/etc/security/adb_keys",
+        name: "adb_keys",
+    },
 ]
 
 filegroup {