tools: binman: ti_board_cfg: improve error message

When there is a lint error the user gets the following cryptic message:

  binman: Node '/path/to/some/node': Yamllint error: 18: comments

This isn't very helpful. Improve the message to tell the user that the
number is actually a line number and also tell the user in which file
they have to look.

Signed-off-by: Michael Walle <mwalle@kernel.org>
Reviewed-by: Neha Malcom Francis <n-francis@ti.com>

tools/binman/etype/ti_board_config.py

@@ -248,7 +248,7 @@ class Entry_ti_board_config(Entry_section):
 
             yaml_config = config.YamlLintConfig("extends: default")
             for p in yamllint.linter.run(open(self._config_file, "r"), yaml_config):
-                self.Raise(f"Yamllint error: {p.line}: {p.rule}")
+                self.Raise(f"Yamllint error: Line {p.line} in {self._config_file}: {p.rule}")
             try:
                 validate(self.file_yaml, self.schema_yaml)
             except Exception as e: