[TG3]: add 5780 fiber support

Add 5780S support by adding a new tg3_setup_fiber_mii_phy() function and
a timer function for parallel link detection. 5780S uses standard MII
registers for 1000BaseX and runs in GMII mode as opposed to TBI mode on
older serdes chips.

Signed-off-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/tg3.h

@@ -2161,6 +2161,10 @@ struct tg3 {
 #define TG3_FLG2_PROTECTED_NVRAM	0x00100000
 #define TG3_FLG2_USING_MSI		0x00200000
 #define TG3_FLG2_JUMBO_CAPABLE		0x00400000
+#define TG3_FLG2_MII_SERDES		0x00800000
+#define TG3_FLG2_ANY_SERDES		(TG3_FLG2_PHY_SERDES |	\
+					TG3_FLG2_MII_SERDES)
+#define TG3_FLG2_PARALLEL_DETECT	0x01000000
 
 	u32				split_mode_max_reqs;
 #define SPLIT_MODE_5704_MAX_REQ		3