extract_dts_includes: Binding merge warning should be enhanced

[erwango]

Building hello_world on nucleo_f401re, I guet the following warning:

extract_dts_includes.py: Merge of 'description': 'Clock gate control information'  overwrites 'Clock gate information'.
extract_dts_includes.py: Merge of 'description': 'Clock gate control information'  overwrites 'Clock gate information'.
extract_dts_includes.py: Merge of 'description': 'Clock gate control information'  overwrites 'Clock gate information'.

This warning is a consequence of #7548
It should not be displayed in this case (description, title and version fields should not produce warning)
Besides, message should be enhanced in order to mention what is the impacted node to investigate.

[erwango]

@b0661 , could you have a look?

[erwango]

Warning is triggered because of clock property is included in st,stm32-uart.yaml and uart.yaml.
So it allowed to detect an actual yaml description issue.

Warning is good, but binding should be fixed