[dice] Move error type to upstream library libdiced_open_dice

This is part of the project of merging the two existing dice
wrapper libraries into one library. The upstream library
libdiced_open_dice will be the merged library.

Test: atest diced_utils_test diced_sample_inputs_test \
diced_test diced_vendor_test
Test: m pvmfw_img microdroid_manager && atest \
microdroid_manager_test
Bug: 267575445

Change-Id: I584dd2f91996d376dff354564b43321ef6535303
diff --git a/diced/open_dice/src/dice.rs b/diced/open_dice/src/dice.rs
index c08cc40..d5e087f 100644
--- a/diced/open_dice/src/dice.rs
+++ b/diced/open_dice/src/dice.rs
@@ -15,11 +15,11 @@
 //! Structs and functions about the types used in DICE.
 //! This module mirrors the content in open-dice/include/dice/dice.h
 
-use core::ptr;
 use open_dice_cbor_bindgen::{
     DiceConfigType, DiceInputValues, DiceMode, DICE_HASH_SIZE, DICE_HIDDEN_SIZE,
     DICE_INLINE_CONFIG_SIZE,
 };
+use std::ptr;
 
 /// The size of a DICE hash.
 pub const HASH_SIZE: usize = DICE_HASH_SIZE as usize;