Add "get by offset" DT helpers

Add new helper functions to read a DT property by its offset. This is
useful when the property's name is unknown, e.g. when iterating through
all properties of a node.

Signed-off-by: Balint Dobszay <balint.dobszay@arm.com>
Change-Id: Ia042905be6de1df545934d76fa8010bb7a2e3f17
2 files changed