ipw2x00: track time using boottime

The ipw2x00 driver family uses get_seconds() to read the current time
for various purposes. This function is deprecated because of the 32-bit
time_t overflow, and it can cause unexpected behavior when the time
changes due to settimeofday() calls or leap second updates.

In many cases, we want to use monotonic time instead, however ipw2x00
explicitly tracks the time spent in suspend, so this changes the
driver over to use ktime_get_boottime_seconds(), which is slightly
slower, but not used in a fastpath here.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Stanislav Yakovlev <stas.yakovlev@gmail.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/intel/ipw2x00/ipw2200.h

@@ -1343,9 +1343,9 @@ struct ipw_priv {
 
 	s8 tx_power;
 
-	/* Track time in suspend */
-	unsigned long suspend_at;
-	unsigned long suspend_time;
+	/* Track time in suspend using CLOCK_BOOTIME */
+	time64_t suspend_at;
+	time64_t suspend_time;
 
 #ifdef CONFIG_PM
 	u32 pm_state[16];