Add efi_rng opt-in backend
#1718
| Job | Run time |
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| 25s | |
| 4m 40s | |
| 17s | |
| 15s | |
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| 14s | |
| 42s | |
| 18s | |
| 27s | |
| 53s | |
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| 48s | |
| 47s | |
| 48s | |
| 1m 51s | |
| 42s | |
| 2m 42s | |
| 13s | |
| 2m 9s | |
| 2m 21s | |
| 33s | |
| 17s | |
| 1m 2s | |
| 1m 28s | |
| 1m 21s | |
| 26m 42s |