[dice] Move KDF related functions to libdiced_open_dice

Bug: 267575445
Test: atest diced_utils_test diced_sample_inputs_test \
diced_test diced_vendor_test diced_open_dice_cbor_test \
libdiced_open_dice_nostd.integration_test \
libdiced_open_dice.integration_test diced_open_dice_cbor_test

Change-Id: I1e2439bd3770b5cec6166fca698b6017a263f029
diff --git a/diced/src/sample_inputs.rs b/diced/src/sample_inputs.rs
index 3f36119..5b61fed 100644
--- a/diced/src/sample_inputs.rs
+++ b/diced/src/sample_inputs.rs
@@ -68,8 +68,7 @@
 /// by `get_input_values_vector`.
 pub fn make_sample_bcc_and_cdis() -> Result<(ZVec, ZVec, Vec<u8>)> {
     let mut dice_ctx = dice::OpenDiceCborContext::new();
-    let private_key_seed = dice_ctx
-        .derive_cdi_private_key_seed(UDS)
+    let private_key_seed = dice::derive_cdi_private_key_seed(UDS)
         .context("In make_sample_bcc_and_cdis: Trying to derive private key seed.")?;
 
     let (public_key, _) =