topology/pcm.c: remove duplicated AC97 hw format

[GitHub pull_request - opened <github@xxxxxxxxxxxxxxxx>]

alsa-project/alsa-lib pull request #138 was opened from aiChaoSONG:

Remove the second occurrence of AC97 hardware format
from audio hardware format array.

Signed-off-by: Chao Song <chao.song@xxxxxxxxxxxxxxx>

Request URL   : https://github.com/alsa-project/alsa-lib/pull/138
Patch URL     : https://github.com/alsa-project/alsa-lib/pull/138.patch
Repository URL: https://github.com/alsa-project/alsa-lib