tg3: Convert code to use PHY_IS_FET

This patch converts the code to use the PHY_IS_FET flag rather than the
ASIC revision to decide whether or not to use FET paths.

Signed-off-by: Matt Carlson <mcarlson@broadcom.com>
Reviewed-by: Michael Chan <mchan@broadcom.com>
Reviewed-by: Benjamin Li <benli@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/tg3.h

@@ -2666,6 +2666,7 @@ struct tg3 {
 #define TG3_FLG3_5755_PLUS		0x00002000
 #define TG3_FLG3_NO_NVRAM		0x00004000
 #define TG3_FLG3_TOGGLE_10_100_L1PLLPD	0x00008000
+#define TG3_FLG3_PHY_IS_FET		0x00010000
 
 	struct timer_list		timer;
 	u16				timer_counter;