automated: linux: fix toml parsing in lmp-device-register

Python libraries toml and tomllib are not API compatible. This patch
switches the code to use a part of API that is the same in both
libraries.

Signed-off-by: Milosz Wasilewski <milosz.wasilewski@foundries.io>

automated/linux/lmp-device-register/check_toml.py

@@ -12,7 +12,7 @@ def main(toml_file):
         import toml as tlib
 
     with open(toml_file, "rb") as f:
-        tlib.load(f)
+        tlib.loads(f.read().decode())
 
 
 if __name__ == "__main__":