ARM: smp: handle "pen_release" removal

commit  b02ac16bb37bfc54967ac49162623db347663e4f from
https://github.com/axxia/linux-yocto.git

 v5.10/standard/preempt-rt/axxia-dev/base

"pen_release" variable was removed from the arch code,
so we need to add private per-SoC definitions for it.

Signed-off-by: Daniel Dragomir <Daniel.Dragomir@windriver.com>
Signed-off-by: John Jacques <john.jacques@intel.com>
Signed-off-by: Quanyang Wang <quanyang.wang@windriver.com>