fdt: Add fdt_getprop_u32_default helpers
Add helper functions to return find a node and return it's property or a default value. Signed-off-by: NKumar Gala <galak@kernel.crashing.org> Signed-off-by: NAndrew Fleming-AFLEMING <afleming@freescale.com> Acked-by: NGerald Van Baren <vanbaren@cideas.com>
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