Add compat changes for hal_wifi_keystore attribute removal.

Commit: b8f7a408 removed three
attributes from public policy.  These attributes could be assigned
to vendor types, and so need to be kept in policy when combined with
vendor policy of that version.

Bug: 62573845
Test: None. Prebuilt change only.
Change-Id: I7d71ef7795f8b82c214c2ef72478c3ca84d1869c

prebuilts/api/26.0/26.0.cil

 ;; private attributes removed from public types
 (typeattributeset domain_deprecated (bluetooth_26_0))
 
+;; attributes removed from current policy
+(typeattribute hal_wifi_keystore)
+(typeattribute hal_wifi_keystore_client)
+(typeattribute hal_wifi_keystore_server)
+
 ;; types removed from current policy
 (type asan_reboot_prop)
 (type log_device)