Some clean up with helper fucntion

Merge series from Zhang Zekun <zhangzekun11@huawei.com>:

There are some helper functions which can be used to simplify the code.
So, let's use these functions to make code more simple.

diff --cc sound/soc/generic/audio-graph-card.c
Simple merge

diff --cc sound/soc/generic/audio-graph-card2.c
Simple merge