ASoC: cros_ec_codec: Fix refcount leak in cros_ec_codec_platform_probe

In the Linux kernel, the following vulnerability has been resolved: ASoC: cros_ec_codec: Fix refcount leak in cros_ec_codec_platform_probe of_parse_phandle() returns a node pointer with refcount incremented, we should use of_node_put() on it when not need anymore. Add missing of_node_put() to avoid refcount leak.