wl12xx: add config_hangover command

Add wl12xx_acx_config_hangover() and respective conf values.
This command configures how long the chip will stay awake
after it was configured to enter psm.

Signed-off-by: Eliad Peller <eliad@wizery.com>
Signed-off-by: Luciano Coelho <coelho@ti.com>
diff --git a/drivers/net/wireless/wl12xx/init.c b/drivers/net/wireless/wl12xx/init.c
index b13bebe..09515f5 100644
--- a/drivers/net/wireless/wl12xx/init.c
+++ b/drivers/net/wireless/wl12xx/init.c
@@ -707,6 +707,11 @@
 	if (ret < 0)
 		goto out_free_memmap;
 
+	/* configure hangover */
+	ret = wl12xx_acx_config_hangover(wl);
+	if (ret < 0)
+		goto out_free_memmap;
+
 	return 0;
 
  out_free_memmap: