Adresses of device tree nodes are typically noted without the '0x'
prefix. While having the '0x' prefix doesn't hurt when using Linux,
more recent versions of U-Boot will add a duplicate ramoops node as a
simple string compare is used to check if the node is already present.
Remove the '0x' prefix to avoid the kernel warning resulting from
U-Boot adding a dupplicate pstore/ramoops node.
See also https://lists.denx.de/pipermail/u-boot/2022-April/481810.html
Signed-off-by: Daniel Golle <daniel@makrotopia.org>
