ASoC: mt6797-mt6351: Fix refcount leak in mt6797_mt6351_dev_probe
In the Linux kernel, the following vulnerability has been resolved:

ASoC: mt6797-mt6351: Fix refcount leak in mt6797_mt6351_dev_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.