libsa: Remove redundant sys/cdefs.h

Sponsored by: Netflix

Remove $FreeBSD$: one-line .c pattern

Remove /^[\s*]*__FBSDID\("\$FreeBSD\$"\);?\s*\n/

MFHead @347527

Sponsored by: The FreeBSD Foundation

Add efi_freebsd_delenv

Add a wrapper around efi_delenv akin to efi_freebsd_getenv and
efi_getenv.

Add efi_delenv

Add an interface to remove / delete UEFI variables.

Add a more generic efi_setenv function.

efi_setenv allows any UEFI variable to be set.

Merge ^/head r343807 through r343955.

Allow reading the UEFI variable size

When loading bigger variables form UEFI it is necessary to know their
size beforehand, so that an appropriate amount of memory can be
allocated. The easiest way

Allow reading the UEFI variable size

When loading bigger variables form UEFI it is necessary to know their
size beforehand, so that an appropriate amount of memory can be
allocated. The easiest way to do this is to try to read the variable
with buffer size equal 0, expecting EFI_BUFFER_TOO_SMALL error to be
returned. Allow such possible approach in efi_getenv routine.

Extracted from a bigger patch as suggested by imp.

Submitted by: Kornel Duleba <mindal@semihalf.com>
Obtained from: Semihalf
Sponsored by: Stormshield

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Merge ^/head r343712 through r343806.

Regularize the Netflix copyright

Use recent best practices for Copyright form at the top of
the license:
1. Remove all the All Rights Reserved clauses on our stuff. Where we
piggybacked others, u

Regularize the Netflix copyright

Use recent best practices for Copyright form at the top of
the license:
1. Remove all the All Rights Reserved clauses on our stuff. Where we
piggybacked others, use a separate line to make things clear.
2. Use "Netflix, Inc." everywhere.
3. Use a single line for the copyright for grep friendliness.
4. Use date ranges in all places for our stuff.

Approved by: Netflix Legal (who gave me the form), adrian@ (pmc files)

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libefi: UEFI_BOOT_VAR_GUID duplicates EFI_GLOBAL_VARIABLE

Drop UEFI_BOOT_VAR_GUID and use EFI_GLOBAL_VARIABLE.

Reviewed by: imp
Differential Revision: https://reviews.freebsd.org/D14696

Move the env convenience routines out of boot1.c.

These routines are more generally useful. Even though boot1 is on its
way out, it's better to make these common during the transition than
copy them.