linuxkpi: Move `GENMASK()` to <linux/bits.h>

... from <linux/bitops.h>.

This matches the location on Linux.

<linux/bits.h> is also included from <linux/bitops.h>. Therefore it will
not break anyth

linuxkpi: Move `GENMASK()` to <linux/bits.h>

... from <linux/bitops.h>.

This matches the location on Linux.

<linux/bits.h> is also included from <linux/bitops.h>. Therefore it will
not break anything.

Reviewed by: bz
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D56584

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