Revert "tracing: Add ioctl() to force ring buffer waiters to wake up"

This reverts commit 84f4be20 which is
commit 01b2a521 upstream.

It breaks the Android kernel ABI and is not needed for normal Android
systems so it is safe to remove.  If it is needed in the future, it can
be brought back in an abi-safe way.

Bug: 161946584
Change-Id: I83a717c01c4fe9cc7fbe2ea79a1da6d55b3196af
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>