[][openwrt][common][audio][Add WM8960 codec and MT7986 audio drivers to sound.mk]

[Description]
Add WM8960 codec and MT7986 audio drivers to sound.mk
for openwrt config options.

kernel: modules: break-out WM8960 codec module
https://github.com/openwrt/openwrt/commit/25ddc6e4372ab20c7d2fa45b98b4288bcad932ec
kernel: modules: package MT7986 audio drivers
https://github.com/openwrt/openwrt/commit/d61b4ecbf109c7f702cafc0307db6b35e92c46b4

[Release-log]
N/A

Change-Id: I6acc2726726acc68fdcfd816188b9b6bd603d00e
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/8390030
2 files changed