API: Use u8 instead of hex str #326

Job	Run time
check-style	19s
unit-tests (crypto-hacspec, ead-none)	54s
unit-tests (crypto-hacspec, ead-zeroconf)	1m 0s
unit-tests (crypto-psa, ead-none)	1m 5s
unit-tests (crypto-psa, ead-zeroconf)	1m 13s
build-static-lib-and-headers (crypto-psa-baremetal)	1m 42s
build-example-for-cortex-m4 (crypto-psa, ead-none)	1m 52s
run-example-on-qemu (crypto-psa, ead-none)	2m 37s
build-edhoc-package (crypto-hacspec, ead-none)	1m 49s
build-static-lib-and-headers (crypto-cryptocell310)	1m 44s
build-example-for-cortex-m4 (crypto-psa, ead-zeroconf)	1m 44s
run-example-on-qemu (crypto-psa, ead-zeroconf)	2m 14s
build-edhoc-package (crypto-hacspec, ead-zeroconf)	1m 34s
build-example-for-cortex-m4 (crypto-cryptocell310, ead-none)	1m 49s
build-coap-example	1m 45s
build-example-for-cortex-m4 (crypto-cryptocell310, ead-zeroconf)	1m 30s
build-edhoc-package (crypto-psa, ead-none)	2m 17s
build-edhoc-package (crypto-psa, ead-zeroconf)	2m 10s
generate-fstar	0s
build-edhoc-package (crypto-psa-baremetal, ead-none)	1m 53s
build-edhoc-package (crypto-psa-baremetal, ead-zeroconf)	1m 51s
build-edhoc-package (crypto-cryptocell310, ead-none)	1m 30s
build-edhoc-package (crypto-cryptocell310, ead-zeroconf)	2m 25s
release	0s
	36m 57s

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