ftrace/x86: Add a comment to why we take text_mutex in ftrace_arch_code_modify_prepare()

Taking the text_mutex in ftrace_arch_code_modify_prepare() is to fix a
race against module loading and live kernel patching that might try to
change the text permissions while ftrace has it as read/write. This
really needs to be documented in the code. Add a comment that does such.

Link: http://lkml.kernel.org/r/[email protected]

Suggested-by: Josh Poimboeuf <[email protected]>
Reviewed-by: Josh Poimboeuf <[email protected]>
Reviewed-by: Petr Mladek <[email protected]>
Signed-off-by: Steven Rostedt (VMware) <[email protected]>

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