kernel/queue: Spinlockify

Straightforward port.  Each struct k_queue object gets a spinlock to
control obvious data ownership.

Note that this port actually discovered a preexisting bug: the -ENOMEM
case in queue_insert() was failing to release the lock.  But because
the tests that hit that path didn't rely on other threads being
scheduled, they ran to successful completion even with interrupts
disabled.  The spinlock API detects that as a recursive lock when
asserts are enabled.

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

include/kernel.h

@@ -1728,6 +1728,7 @@ static inline u32_t k_uptime_delta_32(s64_t *reftime)
 
 struct k_queue {
 	sys_sflist_t data_q;
+	struct k_spinlock lock;
 	union {
 		_wait_q_t wait_q;