[dice] Remove unused module proxy_node_hal

Bug: 268322533
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: If665bb36403b4e5de0ffefe4c3aa37a89024e2fe
2 files changed