linuxkpi: Define `ULL()`

It simply appends "ULL" to its argument.

The amdgpu DRM driver used it at some point in the development cycle of
Linux 6.14 but the use case was dropped later. Let's still

linuxkpi: Define `ULL()`

It simply appends "ULL" to its argument.

The amdgpu DRM driver used it at some point in the development cycle of
Linux 6.14 but the use case was dropped later. Let's still add it to
linuxkpi because it will help if we need to do a git bisect in drm-kmod.

Reviewed by: emaste
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D57703

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