coresight: enable stm logging for ftrace events and printk

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