Added conditionally enabled event state tracing support.
Needed for enhanced debug visibility of tight timed events where
normal print debug messages affect the timing of things. This is a
simple buffer that allows post analysis via gdb of what sequencer
events occurred.
Signed-off-by: David Leach <david.leach@nxp.com>
Signed-off-by: Kumar Gala <kumar.gala@linaro.org>