pass: parser: Use const keyword for configuration file path

pass: parser: Use const keyword for configuration file path

In order to remove the chagnes of the file path of configuration
by internal logic of pass-parser module, use const keyword for them
as following:

- int pass_parser_get_resource_config(struct pass *pass, const char *path)
- int pass_parser_get_each_resource_config(struct pass_resource *res, const char *path)

Change-Id: Ie5440b9c86b26515db2236362e3518743769f565
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>