Don't restrict what EVP_PKEY_Q_keygen can be used for #1109

Job	Run time
check_update	1m 45s
basic_clang	5m 51s
basic_gcc	5m 47s
check_docs	47s
check-ansi	2m 34s
minimal	2m 49s
no-deprecated	5m 25s
non-caching	12m 44s
no-shared-macos (macos-13)	7m 6s
no-shared-ubuntu	4m 32s
self-hosted	0s
no-shared-macos (macos-14)	3m 51s
address_ub_sanitizer	11m 5s
enable_non-default_options	4m 54s
external-test-cf-quiche	3m 35s
external-test-pyca (1.51.0, 3.9)	7m 32s
external-tests	11m 21s
fuzz_tests	3m 2s
full_featured	6m 9s
legacy	4m 51s
no-legacy	5m 43s
memory_sanitizer	18m 25s
out-of-readonly-source-and-install-macos (macos-13)	15m 27s
out-of-readonly-source-and-install-macos (macos-14)	6m 26s
out-of-readonly-source-and-install-ubuntu	7m 50s
threads_sanitizer	5m 29s
	2h 45m 0s

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