power: reset: Add support for Axxia DDR Retention reset

commit  d7341b9b5360cbf3cac4b180c02c8941f3105fa0 from
https://github.com/axxia/linux-yocto.git

 axxia-linux/v5.10/standard/axxia-dev/base

Add support for Axxia X9/AXM56xx reset function which gets called
when Linux calls arm_pm_restart, for doing machine specific restart.

Signed-off-by: John Jacques <john.jacques@intel.com>
Signed-off-by: SangeethaRao <sangeetha.rao@intel.com>
Signed-off-by: Gary McGee <gary.mcgee@intel.com>
Signed-off-by: Marek Majtyka <marekx.majtyka@intel.com>
Signed-off-by: Per Hallsmark <per.hallsmark@windriver.com>
Signed-off-by: Charlie Paul <charlie.paul@windriver.com>
Signed-off-by: Daniel Dragomir <daniel.dragomir@windriver.com>
Signed-off-by: Quanyang Wang <quanyang.wang@windriver.com>