i40e: Remove unused RX realloc stat

After commit 1a557afc4dd5 ("i40e: Refactor receive routine"),
rx_stats.realloc_count is no longer being incremented, so remove it.

The debugfs string was left, but hardcoded to 0. This is intended to
prevent breaking any existing code / scripts that are parsing debugfs
for i40e.

Signed-off-by: Joe Damato <[e-mail]>
Reviewed-by: Jesse Brandeburg <[e-mail]>
Tested-by: Gurucharan G <[e-mail]>
Signed-off-by: Tony Nguyen <[e-mail]>

drivers/net/ethernet/intel/i40e/i40e_debugfs.c

···
 			 rx_ring->rx_stats.alloc_page_failed,
 			 rx_ring->rx_stats.alloc_buff_failed);
 		dev_info(&pf->pdev->dev,
-			 "    rx_rings[%i]: rx_stats: realloc_count = %lld, page_reuse_count = %lld\n",
+			 "    rx_rings[%i]: rx_stats: realloc_count = 0, page_reuse_count = %lld\n",
 			 i,
-			 rx_ring->rx_stats.realloc_count,
 			 rx_ring->rx_stats.page_reuse_count);
 		dev_info(&pf->pdev->dev,
 			 "    rx_rings[%i]: size = %i\n",

drivers/net/ethernet/intel/i40e/i40e_txrx.h

···
 	u64 alloc_page_failed;
 	u64 alloc_buff_failed;
 	u64 page_reuse_count;
-	u64 realloc_count;
 };
 
 enum i40e_ring_state_t {