ARM: axxia: Enabled ddr retention on all axm5516

commit  aa5720ceb28a1ce9b940cbc493cd211c722ec258 from
https://github.com/axxia/linux-yocto.git v5.10/standard/preempt-rt/axxia-dev/base

Enabled ddr retention on all Intel Axxia AXM5516.

Signed-off-by: Fredrik Markstrom <fredrik.markstrom@gmail.com>
Signed-off-by: Anders Roxell <anders.roxell@gmail.com>
(cherry picked from commit 46fc7c97e9d10a47384270e1ea51553ae815add3)
Signed-off-by: Fredrik Gustavsson <fredrik.gustavsson@windriver.com>
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>