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We don't actually need to rely on the oob stall bit, provided hard
irqs are off in the deemed interrupt-free sections, because the latter
is sufficient as long as the code does not traverse a pipeline
synchronization point (sync_current_irq_stage()) while holding a lock,
which would be in and of itself a bug in the first place.

Remove the stall/unstall operations from the evl_spinlock
implementation, fixing the few locations which were still testing the
oob stall bit.

The oob stall bit is still set by Dovetail on entry to IRQ handlers,
which is ok: we will neither use nor affect it anymore, only relying
on hard disabled irqs.

This temporary alignment of the evl_spinlock on the hard spinlock is a
first step to revisit the lock types in the core, before the
evl_spinlock is changed again to manage the preemption count.
Signed-off-by: Philippe Gerum <rpm@xenomai.org>