FROMGIT: driver core: Add device_is_dependent() to linux/device.h

DT implementation of fw_devlink needs this function to detect cycles. So
make it available.

Signed-off-by: Saravana Kannan <saravanak@google.com>
Tested-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Rob Herring <robh@kernel.org>
(cherry picked from commit 7d34ca38
 https://git.kernel.org/pub/scm/linux/kernel/git/robh/linux.git/

 for-next)
Signed-off-by: Saravana Kannan <saravanak@google.com>
Bug: 160736143
Change-Id: I8a457ed80292a5f1f2850b76eba226a7ed4461f7