ice: fix locking for Tx timestamp tracking flush
This is an automated ID intended to aid in discovery of potential security vulnerabilities. The actual impact and attack plausibility have not yet been proven. This ID is fixed in Linux Kernel version v5.14.14 by commit 61616be899975404df44c20ab902464b60882cd7, it was introduced in version v5.14.4 by commit 46720ac66c21bf85e08823664b7b314b85e43f26. For more details please see the references link.