[TG3]: define TG3_FLG2_5750_PLUS flag

Define TG3_FLG2_5750_PLUS flag and set it in tg3_get_invariants for
ASIC_REV_5750 or ASIC_REV_5752.

Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/tg3.h b/drivers/net/tg3.h
index 820df83..0cce404 100644
--- a/drivers/net/tg3.h
+++ b/drivers/net/tg3.h
@@ -2101,6 +2101,7 @@
 #define TG3_FLG2_HW_TSO			0x00010000
 #define TG3_FLG2_SERDES_PREEMPHASIS	0x00020000
 #define TG3_FLG2_5705_PLUS		0x00040000
+#define TG3_FLG2_5750_PLUS		0x00080000
 
 	u32				split_mode_max_reqs;
 #define SPLIT_MODE_5704_MAX_REQ		3