of/reconfig: Add OF_DYNAMIC notifier for platform_bus_type

Add OF notifier handler needed for creating/destroying platform devices
according to dynamic runtime changes in the DT live tree.

Signed-off-by: Pantelis Antoniou <pantelis.antoniou@konsulko.com>
Signed-off-by: Grant Likely <grant.likely@linaro.org>

diff --cc drivers/base/platform.c
Simple merge

diff --cc drivers/of/platform.c
Simple merge

diff --cc include/linux/of_platform.h
Simple merge