[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
7 files changed