[U-Boot] [PATCH 03/11] dtoc: Split out the main class into its own file

[sjg at google.com]

To simplify running tests we should move this class into its own file.
This allows the tests to import it without having to import dtoc.py, which
runs the tests.

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

 tools/dtoc/dtb_platdata.py | 411 +++++++++++++++++++++++++++++++++++++++++++++
 tools/dtoc/dtoc.py         | 408 +-------------------------------------------
 2 files changed, 414 insertions(+), 405 deletions(-)
 create mode 100644 tools/dtoc/dtb_platdata.py

Applied to u-boot-dm, thanks!