unicode: add MODULE_DESCRIPTION() macros

Currently 'make W=1' reports:
WARNING: modpost: missing MODULE_DESCRIPTION() in fs/unicode/utf8data.o
WARNING: modpost: missing MODULE_DESCRIPTION() in fs/unicode/utf8-selftest.o

Add a MODULE_DESCRIPTION() to utf8-selftest.c and utf8data.c_shipped,
and update mkutf8data.c to add a MODULE_DESCRIPTION() to any future
generated utf8data file.

Signed-off-by: Jeff Johnson <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Gabriel Krisman Bertazi <[e-mail]>

fs/unicode/mkutf8data.c

···
 	fprintf(file, "};\n");
 	fprintf(file, "EXPORT_SYMBOL_GPL(utf8_data_table);");
 	fprintf(file, "\n");
+	fprintf(file, "MODULE_DESCRIPTION(\"UTF8 data table\");\n");
 	fprintf(file, "MODULE_LICENSE(\"GPL v2\");\n");
 	fclose(file);
 }

fs/unicode/utf8-selftest.c

···
 module_exit(exit_test_ucd);
 
 MODULE_AUTHOR("Gabriel Krisman Bertazi <[e-mail]>");
+MODULE_DESCRIPTION("Kernel module for testing utf-8 support");
 MODULE_LICENSE("GPL");

fs/unicode/utf8data.c_shipped

···
 	.utf8data = utf8data,
 };
 EXPORT_SYMBOL_GPL(utf8_data_table);
+MODULE_DESCRIPTION("UTF8 data table");
 MODULE_LICENSE("GPL v2");