spinlock: Support ztest mocking

Spinlocks are written above the arch-provided _arch_irq_un/lock()
calls.  But those aren't stubbed by the mocking layer, and as it's not
an "arch" I don't see an obvious place to put them.  Handle them in
spinlock.h.

Signed-off-by: Andy Ross <andrew.j.ross@intel.com>
1 file changed