sys: Remove $FreeBSD$: two-line .h pattern

Remove /^\s*\*\n \*\s+\$FreeBSD\$$\n/

linuxkpi: Move `IS_ENABLED()` and friends to <linux/kconfig.h>

The header is included in <linux/xarray.h> like it is on Linux. Some DRM
code depends on this header "pollution".

Reviewed by: bz
Appr

linuxkpi: Move `IS_ENABLED()` and friends to <linux/kconfig.h>

The header is included in <linux/xarray.h> like it is on Linux. Some DRM
code depends on this header "pollution".

Reviewed by: bz
Approved by: bz
Differential Revision: https://reviews.freebsd.org/D38567

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