drivers: net: vsc9953: Fix FDB aging time

By default, the aging period is set to 0, so the dynamic
FDB entries are never removed. This patch sets the aging
time to 300 seconds.

Signed-off-by: Codrin Ciubotariu <codrin.ciubotariu@freescale.com>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>
diff --git a/include/vsc9953.h b/include/vsc9953.h
index 00aa222..35fcbb5 100644
--- a/include/vsc9953.h
+++ b/include/vsc9953.h
@@ -136,6 +136,9 @@
 /* Macros for vsc9953_ana_ana.adv_learn register */
 #define VSC9953_VLAN_CHK		0x00000400
 
+/* Macros for vsc9953_ana_ana.auto_age register */
+#define VSC9953_AUTOAGE_PERIOD_MASK	0x001ffffe
+
 /* Macros for vsc9953_rew_port.port_tag_cfg register */
 #define VSC9953_TAG_CFG_MASK		0x00000180
 #define VSC9953_TAG_CFG_NONE		0x00000000
@@ -164,6 +167,7 @@
 #define VSC9953_MAX_VLAN		4096
 #define VSC9953_VLAN_CHECK(vid)	\
 	(((vid) < 0 || (vid) >= VSC9953_MAX_VLAN) ? 0 : 1)
+#define VSC9953_DEFAULT_AGE_TIME	300
 
 #define DEFAULT_VSC9953_MDIO_NAME	"VSC9953_MDIO0"