microblaze: Convert to using %pOF instead of full_name

microblaze: Convert to using %pOF instead of full_name

Now that we have a custom printf format specifier, convert users of
full_name to use %pOF instead. This is preparation to remove storing
of the full path string for each node.

Signed-off-by: Rob Herring <robh@kernel.org>
Cc: Michal Simek <monstr@monstr.eu>