Introduce fdt_setprop_placeholder() method

In some cases you need to add a property but the contents of it
are not known at creation time, merely the extend of it.

This method allows you to create a property of a given size (filled
with garbage) while a pointer to the property data will be provided.

Signed-off-by: Pantelis Antoniou <pantelis.antoniou@konsulko.com>
[dwg: Corrected commit message]
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
2 files changed