staging: ktap: remove code from tree

ktap should be merged through the "proper" place in the kernel tree, in
the perf tool, not as a stand-alone kernel module in staging.  So remove
it from here for now so that it can be merged correctly later.

Reported-by: Ingo Molnar <mingo@kernel.org>
Cc: Jovi Zhangwei <jovi.zhangwei@gmail.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>