Revert^2 "[keystore2] Fix binder import path"

Import from the binder crate root instead of binder::public_api for
compatibility with the new crate structure.

Original change: Ia9695e5493bda965ca9a42989ec5a284407595ce

Test: m
Bug: 196056781

Change-Id: Ie6303a36a956cf73f317520a0e0a00ec4adbb47e
diff --git a/diced/src/proxy_node_hal.rs b/diced/src/proxy_node_hal.rs
index 3f31419..8d883d2 100644
--- a/diced/src/proxy_node_hal.rs
+++ b/diced/src/proxy_node_hal.rs
@@ -23,7 +23,7 @@
     InputValues::InputValues as BinderInputValues, Signature::Signature,
 };
 use anyhow::{Context, Result};
-use binder::public_api::Strong;
+use binder::Strong;
 use std::collections::HashMap;
 use std::sync::RwLock;