sys: make the kernel metadata pointer global

The way we got the kernel metadata pointer was by calling
preload_search_by_type with one of the following three: "elf kernel",
"elf32 kernel" and "elf64

sys: make the kernel metadata pointer global

The way we got the kernel metadata pointer was by calling
preload_search_by_type with one of the following three: "elf kernel",
"elf32 kernel" and "elf64 kernel". Which one(s) we used wasn't
consistent though. Sometimes we would only try "elf kernel", and other
times we would try one of the latter two if the first failed. However,
the loader only ever sets "elf kernel" as the kernel type.

Now, the kmdp is a global, preload_kmdp, and it's initialized using
preload_initkmdp in machdep.c (or machdep_boot.c on arm/64).
preload_initkmdp takes a single boolean argument that tells us whether
not finding the kmdp is fatal or not.

Reviewed by: imp, kib
Pull Request: https://github.com/freebsd/freebsd-src/pull/1394

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LinuxKPI: in efi.h include queue.h

sys/linker.h needs sys/queue.h; this gets another wireless driver
closer to compiling on main.

MFC after: 3 days

LinuxKPI: Constantly use _LINUXKPI_ prefix in include guards

MFC after: 1 week
Reviewed by: bz, emaste, hselasky, manu
Differential Revision: https://reviews.freebsd.org/D33562

LinuxKPI: Implement efi_enabled(EFI_BOOT)

efi_enabled(EFI_BOOT) returns true if machine was booted from EFI
Used by drm-kmod and some unported drm drivers like hyperv

MFC after: 1 week
Reviewed by:

LinuxKPI: Implement efi_enabled(EFI_BOOT)

efi_enabled(EFI_BOOT) returns true if machine was booted from EFI
Used by drm-kmod and some unported drm drivers like hyperv

MFC after: 1 week
Reviewed by: hselasky, manu
Differential Revision: https://reviews.freebsd.org/D33300

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