arm64: stackleak: fix currenttopof_stack()
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 v5.15.46 by commit e7308391df97c1891b642cfb4b9be8a9a0a4ff26, it was introduced in version v4.19 by commit 0b3e336601b82c6afa0e9cf21db9cb8793e25399. For more details please see the references link.