Dup ftrace event traffic (including writes to trace_marker file from userspace) to STM. Also dup printk traffic to STM. This allows Linux tracing and log data to be correlated with other data transported over STM. Change-Id: Ieb0b856447f7667eb0005a6a884211dc46f50217 Signed-off-by: Pratik Patel <pratikp@codeaurora.org> (cherry picked from commit 8e1e6b65fe92a0fa7bdb787fc7d9c5c0eae3d654) Conflicts: include/linux/coresight-stm.h kernel/printk.c