[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/resident_node.rs b/diced/src/resident_node.rs
index 0bd5d0d..d65f30c 100644
--- a/diced/src/resident_node.rs
+++ b/diced/src/resident_node.rs
@@ -82,8 +82,8 @@
             .context("In ResidentNode::sign: Failed to get effective_artifacts.")?
             .into_tuple();
         let mut dice = OpenDiceCborContext::new();
-        let seed = dice
-            .derive_cdi_private_key_seed(cdi_attest[..].try_into().with_context(|| {
+        let seed =
+            dice::derive_cdi_private_key_seed(cdi_attest[..].try_into().with_context(|| {
                 format!(
                     "In ResidentNode::sign: Failed to convert cdi_attest (length: {}).",
                     cdi_attest.len()