libfdt: Add support for appending the values to a existing property
Some properties may contain multiple values, these values may need to be added to the property respectively. this patch provides this functionality. The main purpose of fdt_append_prop() is to append the values to a existing property, or create a new property if it dose not exist. Signed-off-by: NMinghuan Lian <Minghuan.Lian@freescale.com> Signed-off-by: NDavid Gibson <david@gibson.dropbear.id.au>
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