Enable Java backend for ISecretKeeper

Bug: 324321147
Test: Manual -- trigger factory reset, confirm ISecretKeeper.deleteAll()
is being called in Trusty logs.

Change-Id: I0f033b53e83ff549f80271ba4a6ebeabac3db922
diff --git a/security/secretkeeper/aidl/Android.bp b/security/secretkeeper/aidl/Android.bp
index 5307bf9..48ce365 100644
--- a/security/secretkeeper/aidl/Android.bp
+++ b/security/secretkeeper/aidl/Android.bp
@@ -28,7 +28,8 @@
     frozen: false,
     backend: {
         java: {
-            enabled: false,
+            enabled: true,
+            platform_apis: true,
         },
         ndk: {
             enabled: true,