aes-gcm-avx512: remove AES round-key preloading #18

Job	Run time
linux-arm64	4m 39s
gcc-min-version	6m 37s
linux-x86	8m 48s
check-c99	3m 11s
threads_sanitizer	9m 13s
external-tests-pkcs11-provider	6m 32s
external-test-bssl	6m 3s
check_docs	1m 23s
check_update	1m 36s
legacy	6m 17s
out-of-readonly-source-and-install-macos	7m 48s
basic_gcc	7m 45s
non-caching	21m 37s
no-shared-macos	4m 50s
freebsd-x86_64	9m 9s
basic_clang	7m 0s
no-deprecated	6m 50s
no-shared-ubuntu	5m 43s
minimal	3m 18s
no-legacy	7m 26s
memory_sanitizer	18m 36s
address_ub_sanitizer	13m 15s
out-of-readonly-source-and-install-ubuntu	8m 58s
full_featured	7m 25s
external-tests-pyca (3.9)	3m 3s
external-tests-oqs-provider	2m 35s
external-test-nss	5m 24s
enable_non-default_options	6m 34s
fuzz_tests	4m 1s
external-tests-misc	6m 59s
	3h 32m 35s

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