LinuxKPI: sync overflow.h from Linux v7.0

overflow.h was imported directly from Linux in 3208d4ad2b8320a.
Update the file to the newer version as needed for v7.0 driver updates.

Sponsored by: The FreeBSD Foundation
MFC after: 3 days
Obtained from: git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git

		028ef9c96e96197026887c0f092424679298aae8 (tag: v7.0)

Reviewed by: emaste, dumbbell
Differential Revision: https://reviews.freebsd.org/D56394