Revert "ia64: kprobes: Use generic kretprobe trampoline handler"

This reverts commit d3380de4.

Since this commit is a part of generic kretprobe trampoline
handler series, without the other patches in that series, this
causes a build error on ia64.

Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>