Remove java generated files

Remove improper import and make the flag a constant
with the read only option

Bug: 191777960
Test: m keystore2
Change-Id: I34bd2d0d891686c93a167456e8d50eec75374244
diff --git a/keystore2/aconfig/flags.aconfig b/keystore2/aconfig/flags.aconfig
index 04bbddc..eb636bb 100644
--- a/keystore2/aconfig/flags.aconfig
+++ b/keystore2/aconfig/flags.aconfig
@@ -5,4 +5,5 @@
   namespace: "hardware_backed_security"
   description: "This flag controls changing journalmode to wal"
   bug: "191777960"
+  is_fixed_read_only: true
 }