Fix EEE control register address and add 5G/10G EEE defines

Register RTL8373_EEE_CTRL_BASE did not actually exist at 0x606c,
instead RTL837X_EEE_STATUS is actually not only a status, but also
a control register for EEE enable/disable at the MAC.

The defines are not actually register bits, but port EEE settings,
so move them to rtl837x_port.h while adding 5G/10G flags.

rtl837x_port.h

@@ -33,6 +33,16 @@ struct vlan_settings {
 	uint16_t tagged;
 };
 
+/* 
+ * Port EEE settings
+ */
+#define EEE_100 	0x01
+#define EEE_1000	0x04
+#define EEE_2G5		0x10
+#define EEE_5G		0x20
+#define EEE_10G		0x40
+#define EEE_NORESET	0x80
+
 extern __xdata struct vlan_settings vlan_settings;
 
 uint8_t port_l2_forget(void) __banked;