wl12xx: Use a dedicated fw for PLT

A special PLT firmware is used for calibration.

Add multiple fw support by introducing a new fw_type member,
representing the currently saved fw (the actual fw state
can be determined by wl->state).

Signed-off-by: Gery Kahn <geryk@ti.com>
Signed-off-by: Eliad Peller <eliad@wizery.com>
Signed-off-by: Luciano Coelho <coelho@ti.com>
diff --git a/drivers/net/wireless/wl12xx/debugfs.c b/drivers/net/wireless/wl12xx/debugfs.c
index 00dbe15..e1cf727 100644
--- a/drivers/net/wireless/wl12xx/debugfs.c
+++ b/drivers/net/wireless/wl12xx/debugfs.c
@@ -113,7 +113,7 @@
 	if (ret < 0)
 		goto out;
 
-	if (wl->state == WL1271_STATE_ON &&
+	if (wl->state == WL1271_STATE_ON && !wl->plt &&
 	    time_after(jiffies, wl->stats.fw_stats_update +
 		       msecs_to_jiffies(WL1271_DEBUGFS_STATS_LIFETIME))) {
 		wl1271_acx_statistics(wl, wl->stats.fw_stats);