regmap: Improve error handling

ofnode_read_simple_addr_cells may fail and return a negative error code.
Check for this when initializing regmaps.

Also check if both_len is zero, since this is perfectly possible, and
would lead to a division-by-zero further down the line.

Reviewed-by: Anatolij Gustschin <[email protected]>
Reviewed-by: Simon Glass <[email protected]>
Signed-off-by: Mario Six <[email protected]>

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