CRAS:Fix Capture gain on Logitech C505

The default gain is 24dB for C505, which is too high that the signal
saturates on high frequencies. Lower it to it minimum 6dB.

BUG=b:172856270
TEST=Verified the capture gain on C505 is correct.

Change-Id: Iefd3e4b55d5906db23aa11b7b1768aef20ff7ce5
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/adhd/+/2573848
Tested-by: En-Shuo Hsu <enshuo@chromium.org>
Auto-Submit: En-Shuo Hsu <enshuo@chromium.org>
Reviewed-by: Yu-Hsuan Hsu <yuhsuan@chromium.org>
Commit-Queue: En-Shuo Hsu <enshuo@chromium.org>
2 files changed