ixgbe: correct disable_rx_buff timeout

The current value of the udelay timeout for ixgbe_disable_rx_buff is too
short. This causes the security path to not not be properly disabled during
the section that is meant to have it turned off. The end result causes a race
condition that results in RX issues.
Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Tested-by: Phil Schmitt <phillip.j.schmitt@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

drivers/net/ethernet/intel/ixgbe/ixgbe_common.c

@@ -2561,7 +2561,7 @@ s32 ixgbe_disable_rx_buff_generic(struct ixgbe_hw *hw)
 			break;
 		else
 			/* Use interrupt-safe sleep just in case */
-			udelay(10);
+			udelay(1000);
 	}
 
 	/* For informational purposes only */