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Add `efi_rng` opt-in backend #287

Job	Run time
Cross (x86_64-unknown-illumos)	36s
UEFI RNG Protocol (aarch64-unknown-uefi)	30s
Linux x32 (x86_64-unknown-linux-gnux32)	27s
UEFI RNG Protocol (x86_64-unknown-uefi)	32s
UEFI RNG Protocol (i686-unknown-uefi)	30s
Apple Other	1m 2s
No Atomics	17s
RNDR	23s
RDRAND UEFI (x86_64-unknown-uefi)	29s
RDRAND UEFI (i686-unknown-uefi)	28s
Tier 2 (aarch64-linux-android)	19s
Tier 2 (x86_64-unknown-fuchsia)	14s
Tier 3 (aarch64-kmc-solid_asp3)	26s
Tier 2 (x86_64-unknown-redox)	18s
Web no_std	27s
Tier 3 (aarch64-unknown-nto-qnx710)	20s
Tier 2 (x86_64-fortanix-unknown-sgx)	15s
Web no_std with Atomics	30s
Tier 3 (armv6k-nintendo-3ds)	21s
Web	33s
Tier 3 (armv7-sony-vita-newlibeabihf)	19s
Web with Atomics	31s
Tier 3 (i686-unknown-hurd-gnu)	24s
Tier 3 (riscv32imc-esp-espidf)	19s
Tier 3 (x86_64-unknown-hermit)	26s
WasmV1 no_std	25s
Tier 3 (x86_64-wrs-vxworks)	21s
WasmV1 no_std with Atomics	30s
Tier 3 (x86_64-unknown-dragonfly)	21s
Tier 3 (x86_64-unknown-haiku)	22s
	12m 55s

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