mt76: mt7921: fix possible invalid register access
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 v5.12.4 by commit b13cbc536990ff609afa878b6211cd6f6265ba60, it was introduced in version v5.12 by commit ffa1bf97425bd511b105ce769976e20a845a71e9. For more details please see the references link.