EFI variable access is slow, hence let's avoid it if there's no need. Let's cache the result of efi_measured_uki() so that we don't have to go to the EFI variables each time. This only caches in the yes/no case. If we encounter an error we don't cache, so that we go to disk again. This should optimize things a bit given we now have a bunch of services which are conditioned with this at boot.
System and Service Manager
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