Import CK as of 21d3e319407d19dece16ee317c757ffc54a452bc, which makes its
sparcv9 atomics compatible with the FreeBSD kernel by using instructions
which access the appropriate address space.
Atomic operations within the kernel must access the nucleus address space
instead of the default primary one. Without this change but the increased
use of CK in the kernel, machines started to panic after some minutes of
uptime due to an unresolvable fault in ck_pr_cas_64_value().