Add support for getting early entropy from UEFI

UEFI provides a protocol for accessing randomness. This is a good way
to gather early entropy, especially when there's no driver for the RNG
on the pl

Add support for getting early entropy from UEFI

UEFI provides a protocol for accessing randomness. This is a good way
to gather early entropy, especially when there's no driver for the RNG
on the platform (as is the case on the Marvell Armada8k (MACCHIATObin)
for now).

If the entropy_efi_seed option is enabled in loader.conf (default: YES)
obtain 2048 bytes of entropy from UEFI and pass is to the kernel as a
"module" of name "efi_rng_seed" and type "boot_entropy_platform"; if
present, ingest it into the kernel RNG.

Submitted by: Greg V
Reviewed by: markm, kevans
Approved by: csprng (markm), re (delphij)
Differential Revision: https://reviews.freebsd.org/D20780

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lualoader: fix the autoboot_delay countdown message

When the timer drops from double to single digits, a spare 'e' is left
on the end of the line as we don't overwrite it. Include an extra space
at

lualoader: fix the autoboot_delay countdown message

When the timer drops from double to single digits, a spare 'e' is left
on the end of the line as we don't overwrite it. Include an extra space
at the end to account for this and overwrite the leftover character.

PR: 259429

(cherry picked from commit bb4c691299c5d699cea29e18fef96bda1cef13da)

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