linuxkpi: Add `int_sqrt()`

The implementation comes from `isqrt64()` in `sys/cam/cam_iosched.c`. It
is modified to take an `unsigned long` and return an `unsigned int`.

The i915 DRM driver started

linuxkpi: Add `int_sqrt()`

The implementation comes from `isqrt64()` in `sys/cam/cam_iosched.c`. It
is modified to take an `unsigned long` and return an `unsigned int`.

The i915 DRM driver started to use it in Linux 6.15.

Reviewed by: bz
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D58251

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