linuxkpi: Define `DEFINE_CLASS()` and `CLASS()`HEADmain

`DEFINE_CLASS()` is in fact named `LINUXKPI_DEFINE_CLASS()` because it
conflicts with `DEFINE_CLASS()` defined in <sys/kobj.h>.

This macro defines a type and a pair of constructor/destructor
functions.

They are to be used by `CLASS()`: this one declares a variable,
initialise it with the constructor and set the `__cleanup()` attribute
to call the destructor once the variable goes out of scope.

The DRM drivers generic code started to use `CLASS()` in Linux 6.13. It
requires the `fd` class to be defined in <linux/file.h>.

Reviewed by:	bz
Sponsored by:	The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D57583

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