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Add `efi_rng` opt-in backend #195

Job	Run time
Apple Other	50s
UEFI RNG Protocol (aarch64-unknown-uefi)	32s
Cross (sparcv9-sun-solaris)	27s
UEFI RNG Protocol (x86_64-unknown-uefi)	27s
ESP-IDF	23s
UEFI RNG Protocol (i686-unknown-uefi)	30s
Linux x32 (x86_64-unknown-linux-gnux32)	25s
Cross (x86_64-unknown-illumos)	27s
No Atomics	13s
RDRAND UEFI (x86_64-unknown-uefi)	33s
Tier 2 (x86_64-unknown-fuchsia)	25s
RNDR	24s
RDRAND UEFI (i686-unknown-uefi)	34s
Tier 3 (aarch64-kmc-solid_asp3)	22s
Web no_std	25s
Tier 2 (x86_64-unknown-redox)	13s
Tier 3 (aarch64-unknown-nto-qnx710)	20s
Web no_std with Atomics	31s
Tier 2 (x86_64-fortanix-unknown-sgx)	15s
Tier 3 (armv6k-nintendo-3ds)	20s
Web	30s
Tier 3 (armv7-sony-vita-newlibeabihf)	25s
Web with Atomics	37s
Tier 3 (i686-unknown-hurd-gnu)	23s
WasmV1 no_std	23s
Tier 3 (x86_64-unknown-hermit)	23s
WasmV1 no_std with Atomics	28s
Tier 3 (x86_64-wrs-vxworks)	22s
Tier 3 (x86_64-unknown-dragonfly)	22s
Tier 3 (x86_64-unknown-haiku)	26s
	12m 55s

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