CRAS: cras_server_metrics - Fix some bugs about device type

Fix some mistakes about device type.
1. Replace CRAS_METRICS_DEVICE_NORMAL(ABNORMAL)_SILENT_HOTWORD with
CRAS_METRICS_DEVICE_SILENT_HOTWORD because the silent hotword should
always be in the normal situation.
2. Typo 'slient' -> 'silent'
3. Let CRAS_CLIENT_TYPE_SERVER_STREAM be converted to string.

BUG=b:141286272
TEST=These logs can be recorded correctly on eve.

Change-Id: I9d6cec57278db3f61df474d40ad1968443363f34
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/adhd/+/1836844
Reviewed-by: Cheng-Yi Chiang <cychiang@chromium.org>
Tested-by: Yu-Hsuan Hsu <yuhsuan@chromium.org>
Commit-Queue: Yu-Hsuan Hsu <yuhsuan@chromium.org>
2 files changed