Revert "cras_dlc: Reduce D-Bus timeout to 0.5 seconds"

This reverts commit a661e14.

Reason for revert: cras_dlc has a dedicated thread now so it
should no longer block CRAS clients.

Original change's description:
> cras_dlc: Reduce D-Bus timeout to 0.5 seconds
>
> Chrome expects the audio (cras client) thread to terminate within
> 3 seconds.
>
> At worst cras_dlc_manager may block CRAS clients for
> 2 * ${number of DLCs} * ${timeout per D-Bus call}.
>
> Reduce the timeout as a quick and dirty fix.
>
> BUG=b:281964203
> TEST=None
>
> Change-Id: I629376114db9f9a308b7e508cbaf555021639315
> Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/adhd/+/4531332
> Reviewed-by: Yu-Hsuan Hsu <[email protected]>
> Tested-by: ChromeOS Audio Quick Verifier <[email protected]>
> Reviewed-by: Hung-Hsien Chen <[email protected]>
> Commit-Queue: Hung-Hsien Chen <[email protected]>
> Commit-Queue: Li-Yu Yu <[email protected]>

BUG=b:281964203
BUG=b:356757499
TEST=None

Change-Id: I4c7cf587e80a38dc47edcb3f52750b4f6a33d5a1
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/adhd/+/6051286
Commit-Queue: Li-Yu Yu <[email protected]>
Tested-by: Li-Yu Yu <[email protected]>
Reviewed-by: Hung-Hsien Chen <[email protected]>
Reviewed-by: Yu-Hsuan Hsu <[email protected]>

cras/server/platform/dlc/src/chromiumos.rs

@@ -14,7 +14,7 @@ use system_api::dlcservice::InstallRequest;
 
 use super::Result;
 
-const DBUS_TIMEOUT: Duration = Duration::from_millis(500);
+const DBUS_TIMEOUT: Duration = Duration::from_secs(3);
 
 fn get_dlcservice_connection_path(connection: &Connection) -> Proxy<&Connection> {
     connection.with_proxy(