ARM: axxia: Make the dma-zone the full 4G

commit e031dafe

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

Make the dma-zone the full 4G.

Signed-off-by: Fredrik Markstrom <fredrik.markstrom@gmail.com>
Signed-off-by: Anders Roxell <anders.roxell@gmail.com>
(cherry picked from commit 560985a7a385d3e6318da9dc41e1f30b3bdd3d65)
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>
Signed-off-by: Liwei Song <liwei.song@windriver.com>