use trace_printk instread of __trace_puts

Reynold Chery reported ktap compile failed in Linux Mint(3.5.0)

This is becasue __trace_puts introduced in 3.8,
so use trace_printk instead.

Link: https://github.com/ktap/ktap/issues/2

Reported-by: Reynold Chery
Signed-off-by: zhangwei(Jovi) <jovi.zhangwei@huawei.com>