x86/ftrace: Remove extra orig rax move

There's identical move 2 lines earlier.

Link: https://lkml.kernel.org/r/20211008091336.33616-2-jolsa@kernel.org



Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>