core: fix doc comments of dev_read_addr*() and related functions

- The dev_read_addr_name*() family of functions has no "index" argument,
  doc comments should refer to "name"
- Specify the error return for several devfdt_get_addr*() functions

Signed-off-by: Matthias Schiffer <matthias.schiffer@ew.tq-group.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
2 files changed