ARM: zImage: atags_to_fdt: Fix node names on added root nodes

Commit 7536c7e03e74 ("of/fdt: Remove redundant kbasename function
call") exposed a bug creating DT nodes in the ATAGS to DT fixup code.
Non-existent nodes would mistaken get created with a leading '/'. The
problem was fdt_path_offset() takes a full path while creating a node
with fdt_add_subnode() takes just the basename.

Since this we only add root child nodes, we can just skip over the '/'.

Fixes: 7536c7e03e74 ("of/fdt: Remove redundant kbasename function call")
Reported-by: Chris Packham <[email protected]>
Cc: Qi Zheng <[email protected]>
Cc: Russell King <[email protected]>
Signed-off-by: Rob Herring <[email protected]>
Tested-by: Chris Packham <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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