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 <s...@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
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