conf/pistachio: fix syntax

alsa-project/alsa-lib pull request #470 was opened from blino:

It was missing closing brackets since its introduction.

Fixes: 4dfa8f08fb83 ("conf/cards: add support for pistachio-card.")

Request URL : https://github.com/alsa-project/alsa-lib/pull/470 Patch URL : https://github.com/alsa-project/alsa-lib/pull/470.patch Repository URL: https://github.com/alsa-project/alsa-lib