[dice] Remove unneeded dependence ZVec for libdiced_open_dice

ZVec was used in the original dice std wrapper
libdiced_open_dice_cbor, now as all that library has been merged
into libdiced_open_dice and ZVec is no longer used anywhere. We
can remove the error about ZVec.

Bug: 267575445
Test: atest diced_utils_test diced_sample_inputs_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: I7499ed84886cced8b640dd93e0d3aecfafe380b8
2 files changed