scripts: Use yaml.safe_load()

Before PyYAWL 4.1, yaml.load() can load to arbitrary code execution.
yaml.safe_load() is recommended as a safe alternative. Starting at v4.1,
yaml.load() calls yaml.safe_load().

See https://seclists.org/oss-sec/2018/q2/240 for more information.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Tested-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>

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