genboardscfg.py: Remove "warnings" print section

We tell kconfiglib to not print any warnings to us so drop this code as
it will be unused.

Cc: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Tom Rini <trini@konsulko.com>

tools/genboardscfg.py

@@ -165,11 +165,7 @@ class KconfigScanner:
                 else:
                     f.write(line[colon + 1:])
 
-        warnings = self._conf.load_config(self._tmpfile)
-        if warnings:
-            for warning in warnings:
-                print('%s: %s' % (defconfig, warning))
-
+        self._conf.load_config(self._tmpfile)
         try_remove(self._tmpfile)
         self._tmpfile = None