[U-Boot] [PATCH 03/45] dm: core: Add a function to find the first inactive child

[sjg at google.com]

Some devices have children and want to press an existing inactive child
into service when needed. Add a function to help with this.

Signed-off-by: Simon Glass <sjg at chromium.org>
---

 drivers/core/device.c | 18 ++++++++++++++++++
 include/dm/device.h   | 15 +++++++++++++++
 test/dm/core.c        | 31 +++++++++++++++++++++++++++++++
 3 files changed, 64 insertions(+)

Applied to u-boot-dm