[1/2] libfdt: Add phandle related functions

[Jon Loeliger]

So, like, the other day David Gibson mumbled:
> This patch adds fdt_get_phandle() and fdt_node_offset_by_phandle()
> functions to libfdt.  fdt_get_phandle() will retreive the phandle
> value of a given node, and fdt_node_offset_by_phandle() will locate a
> node given a phandle.
> 
> Signed-off-by: David Gibson <david at gibson.dropbear.id.au>

Applied.

jdl