[U-Boot] [PATCH 04/11] dtoc: Fix pylint warnings

[sjg at google.com]

Unfortunately I neglected to run pylint on this tool with its initial
submission. Fix the warnings.

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

 tools/dtoc/dtb_platdata.py | 261 ++++++++++++++++++++++++---------------------
 tools/dtoc/dtoc.py         |  14 +--
 2 files changed, 144 insertions(+), 131 deletions(-)

Applied to u-boot-dm, thanks!