[dice] Add DiceKdf wrapper to libdiced_open_dice

This function will be used to derived the sealing key for
encrypted storage in Microdroid later.

Bug: 267575445
Test: atest libdiced_open_dice_nostd.integration_test \
libdiced_open_dice.integration_test \
diced_open_dice_cbor_test

Change-Id: I7c2e2eb49c3942a3d0c67f076d311a939da754d4
diff --git a/diced/open_dice/src/lib.rs b/diced/open_dice/src/lib.rs
index 9184a44..0efea61 100644
--- a/diced/open_dice/src/lib.rs
+++ b/diced/open_dice/src/lib.rs
@@ -34,6 +34,6 @@
     PRIVATE_KEY_SEED_SIZE,
 };
 pub use error::{check_result, DiceError, Result};
-pub use ops::hash;
+pub use ops::{hash, kdf};
 #[cfg(feature = "std")]
 pub use retry::{retry_bcc_format_config_descriptor, retry_bcc_main_flow, OwnedDiceArtifacts};