core: delay: fix timeout expiration threshold

Fix timeout threshold that should return once the time expires,
not 1 tick after it has expired. This change makes udelay(0) to
immediately return and not wait a generic timer counter increment.

This change fixes an issue where a driver stops the counter feeding
Arm generic timer counter and indirectly calls IO_READ32_POLL_TIMEOUT()
with a delay of 0us. It that case, since counter never increments, the
udelay(0) call in IO_READ32_POLL_TIMEOUT() never returns while we expect
the macro to endlessly poll (as timeout would never be detected) until
poll condition is met or system watchdog is triggered.

Signed-off-by: Etienne Carriere <[email protected]>

core/include/kernel/delay.h

@@ -52,7 +52,7 @@ static inline uint64_t timeout_init_us(uint32_t us)
 
 static inline bool timeout_elapsed(uint64_t expire)
 {
-	return delay_cnt_read() > expire;
+	return delay_cnt_read() >= expire;
 }
 
 /*