chameleond: fix bluetooth grpc server init process The kernel updates the Class of Device (COD) when SetDiscoverable is called and reads the COD value from an internal cache. Using the hciconfig tool to change the COD does not update this kernel cache. Consequently, the next time SetDiscoverable is called, the kernel will use the stale COD value from its cache, overwriting any changes made via hciconfig. To modify the COD correctly and ensure the kernel's cache is updated, use the control socket interface instead. BUG=b:445279971 TEST=Bluetooth suspend and resume tests Change-Id: I395cd85e7dd45beb9197e02a114f9839955e654f Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/chameleon/+/6975427 Commit-Queue: ChromeOS Auto Runner <[email protected]> Tested-by: John Lai <[email protected]> Reviewed-by: Yun-hao Chung <[email protected]> Commit-Queue: John Lai <[email protected]> Auto-Submit: John Lai <[email protected]>