[U-Boot] [PATCH 13/45] doc: Update docs for device tree in SPL, TPL

[sjg at google.com]

Make a few small updates to indicate that device tree can be used in SPL
and TPL.

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

 doc/README.fdt-control      | 10 ++++++++++
 doc/driver-model/README.txt |  3 ++-
 2 files changed, 12 insertions(+), 1 deletion(-)

Applied to u-boot-dm