[PATCH 09/21] dm: core: Add ofnode_read_prop()

[sjg at google.com]

Add a new function to read a property that supports reading the length as
well.

Reimplement ofnode_read_string() using it and fix its comment.

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

 drivers/core/ofnode.c | 31 ++++++++++++++++++++++++-------
 include/dm/ofnode.h   | 13 ++++++++++++-
 test/dm/ofnode.c      | 26 ++++++++++++++++++++++++++
 3 files changed, 62 insertions(+), 8 deletions(-)

Applied to u-boot-dm, thanks!