[][kernel][mt7988][pinctrl][update mt7988 pcm and i2c audio pins]

[Description]
Refactor audio pins
This patch renamed 'pcm' function to 'audio' function,
and this function include two groups 'pcm' and 'i2s'

[Release-log]
N/A

Change-Id: I75f566240ce6f0d8d9729de998f07e2bcba378d4
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/6674043
Build: srv_hbgsm110
1 file changed