Since str_has_prefix() takes the prefix as the 2nd argument and the string
as the first, is_cfi_preamble_symbol() always fails to check the prefix.
Fix the function parameter order so that it correctly check the prefix.

Link: https://lore.kernel.org/all/172260679559.362040.7360872132937227206.stgit@devnote2/

Fixes: de02f2ac ("kprobes: Prohibit probing on CFI preamble symbol")
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>