Work around VNET and DPCPU related panics on aarch64

Work around VNET and DPCPU related panics on aarch64

lld >= 14 and recent GNU ld can relax adrp+add and adrp+ldr
instructions, which breaks VNET and DPCPU when used in modules.

Until VNET and DPCPU can be fixed to deal with these relaxed
instructions, disable linker relaxation for now.

PR:		264094
Reviewed by:	markj
MFC after:	3 days
Differential Revision: https://reviews.freebsd.org/D41156

(cherry picked from commit 80e4ac2964a11edef456a15b77e43aadeaf273a2)
(cherry picked from commit f1f27dfa4ad9da53fcdfc6aae644fab83bda4e76)

Approved by:	so
Security:	FreeBSD-EN-23:08.vnet