i386/stand/lib: Nix trailing whitespace and tidy comments a bit.

No functional change intended.

PR port-amd64/49470: NetBSD 7 BETA reboots after bootloader (HP 2133)

Allocate buf[6] instead of buf[5] to work around buggy firmware, which may
write mementry to 24 bytes instead 20 requested with ACPI 3.0 enabled,
causing corrupted stack and wrong marks[] values in c

Allocate buf[6] instead of buf[5] to work around buggy firmware, which may
write mementry to 24 bytes instead 20 requested with ACPI 3.0 enabled,
causing corrupted stack and wrong marks[] values in common_load_kernel().
This in turn was leading to erroneous caluclations and memory addresses.
This eventually may result in null pointer dereference in the kernel and sudden
reboot for VIA based systems.

Commit should fix boot issues for VIA C7-M based HP 2133 Mini-Note,
mentioned in the original bug report. For AMD based HP Compaq 6005 Pro
discussed in a separate thread, the issue may be different.

Tested on my VIA C7-D based Biostar Viotech 3100+ motherboard.

needs-pullups to 9, 10.

PR install/49470

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Add multiboot 2 support to x86 bootloaders

multiboot 2 is required to boot Xen on an EFI system.
This also require a kernel patch for properly discovering
the ACPI RSDP, which is available after 201

Add multiboot 2 support to x86 bootloaders

multiboot 2 is required to boot Xen on an EFI system.
This also require a kernel patch for properly discovering
the ACPI RSDP, which is available after 20190912, in
src/sys/arch/x86/acpi/acpi_machdep.c 1.26-1.28

There are a few missing bit in this multiboot 2 implementation
(which are unused by Xen):
- Header tags Address, Freambuffer, and Relocatable are ignored
- Tags APM and Network are not provided
- Tags ACPI old and ACP new are only provided for ACPI boot
- Tag boot device does not provides the subpart (BSD disklabel partition)

Notes:
- multiboot2 is disabled in dosboot, otherwise the binary
gets too big and build fails.
- in src/sys/arch/i386/stand/efiboot, consinit() is renamed
as efi_consinit() to avoid prototype conflicts in src/sys/sys/systm.h

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ANSI and KNF from Anon Ymous

merge ktrace-lwp.

remove license clauses 3 and 4 from my cpoyright notices

b*()->mem*()

add a function to pass the "memory map" ie the outcome of INT15/0xe820,
to the kernel