Convert string compares of DT node names to use of_node_name_eq() helper
instead. This removes direct access to the node name pointer.

Link: https://lore.kernel.org/r/20200416215114.7715-1-robh@kernel.orgSigned-off-by: Rob Herring <robh@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>