linuxkpi: Define `for_each_if()`

This macro was moved from <drm/drm_util.h> to <linux/util_macros.h> in
Linux 6.15.

Submitted by: Sourojeet Adhikari
Approved by: adrian, bz, emaste, seuros
Sponsore

linuxkpi: Define `for_each_if()`

This macro was moved from <drm/drm_util.h> to <linux/util_macros.h> in
Linux 6.15.

Submitted by: Sourojeet Adhikari
Approved by: adrian, bz, emaste, seuros
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D57465

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