tracing: Merge irqflags + preemt counter, add RT bits

This is an all-in-one patch updating the tracing patches to what Steven
merged into this tracing tree and posted as part of his for-next series
in
   https://lkml.kernel.org/r/20210203160517.982448432@goodmis.org



Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>