VoCore2: OpenWrt 23.05 Sound Part

Finally sound part works. Thanks to contributor patches.

The problem is caused by DMA did not correctly stopped before I2S stop, then DMA write to invalid memory address then casued watch dog reset the hole system, no oops.

Patches has upload to: https://github.com/Vonger/vocore2/tree/master/openwrt.2305

OpenWrt source code patch openwrt.patch folder, linux kernel patch at kernel.sound folder, need to copy to target/linux/ramips/patches-5.15

In menuconfig, need to select kmod-mt7628-es8388, kmod-i2c-mt7628 etc… For simple just copy menu.config to .config in your openwrt folder, will compile everything.