Fix: Use YAML config by default

Sice the JSON config was added and default, that breaks the
original behavior of taking it from the YAML config, it should
be used by default.

Tested: When `--enable-use_json` was added in phosphor-led-manager_git.bbapped,
the JSON config was used, otherwise, the YAML config was used.

Signed-off-by: George Liu <liuxiwei@inspur.com>
Change-Id: I599db99c132fbf402a262e0ee04b2ece5efb32da
2 files changed