tg3: Bypass power source switching for 57765

The 57765 repurposes all the GPIOs normally used to switch power sources
when configured as a NIC device.  This patch changes the code to avoid
touching the GPIOs for this asic rev.

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.c

@@ -2021,7 +2021,9 @@ static void tg3_frob_aux_power(struct tg3 *tp)
 {
 	struct tg3 *tp_peer = tp;
 
-	if ((tp->tg3_flags2 & TG3_FLG2_IS_NIC) == 0)
+	/* The GPIOs do something completely different on 57765. */
+	if ((tp->tg3_flags2 & TG3_FLG2_IS_NIC) == 0 ||
+	    GET_ASIC_REV(tp->pci_chip_rev_id) == ASIC_REV_57765)
 		return;
 
 	if (GET_ASIC_REV(tp->pci_chip_rev_id) == ASIC_REV_5704 ||