This ports the following barebox commit and removes the now no longer used noop
definition of of_find_node_by_devpath() that was introduced in commit "state:
find device node from device path, not from device node path":

| commit 1eddb0d
| Author: Sascha Hauer <s.hauer@pengutronix.de>
| Date:   Tue Feb 20 12:41:26 2018 +0100
|
|     state: find backend node with its reproducible name
|
|     When fixing up the kernels state nodes we depended on the full node path
|     of the input device tree. This does not work when the kernel device tree
|     has different names. This has happened lately when the i.MX6 device
|     trees got their leading zeroes removed from the node names.
|
|     Use of_find_node_by_reproducible_name() to find the node corresponding
|     to the storage backend node in the kernel device tree.
|
|     Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Signed-off-by: Ulrich Ölmann <u.oelmann@pengutronix.de>
Signed-off-by: Roland Hieber <rhi@pengutronix.de>