PKCS11: Re-add handling of CKD_NULL case #2050

Job	Run time
build on fedora:38 (gcc, false)	2m 2s
build on fedora:38 (clang, false)	2m 7s
build on fedora:37 (gcc, false)	1m 50s
build on ubuntu:23.10 (gcc,false)	1m 28s
build on fedora:37 (clang, false)	2m 10s
build on ubuntu:23.10 (clang,false)	1m 28s
build on ubuntu:23.04 (gcc,false)	1m 23s
build on macos (macos-latest)	2m 0s
build on ubuntu:23.04 (clang,false)	1m 44s
build on centos:7 (gcc, true)	2m 6s
build on macos (macos-latest-xlarge)	42s
build on ubuntu:22.04 (gcc,false)	1m 17s
build on ubuntu:22.04 (clang,true)	1m 39s
build on ubuntu:20.04 (gcc,false)	1m 17s
build on ubuntu:20.04 (clang,false)	1m 37s
build on ubuntu:18.04 (gcc,false)	1m 13s
build on ubuntu:16.04 (gcc,false)	1m 23s
build on ubuntu:14.04 (gcc,false)	1m 11s
build on debian:12 (gcc,false)	1m 35s
build on debian:12 (clang,false)	1m 33s
build on debian:11 (gcc,false)	1m 20s
build on debian:11 (clang,false)	1m 35s
build on debian:10 (gcc,false)	1m 24s
run unit tests (ubuntu:22.04, clang)	10m 10s
run unit tests (centos:7, gcc)	10m 3s
	56m 17s

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