pine64-pinephonepro: fix audio with alsa-lib 1.2.7
Let /usr/share/alsa/ucm2/conf.d/simple-card/*.conf be a symlink, as it is expected since alsa-lib 1.2.7.
Related: https://github.com/alsa-project/alsa-lib/commit/d6adde0e32376554e461098dcd7cfdb824fabd1e