ethernet/intel: Use eth_skb_pad and skb_put_padto helpers

Update the Intel Ethernet drivers to use eth_skb_pad() and skb_put_padto
instead of doing their own implementations of the function.

Also this cleans up two other spots where skb_pad was called but the length
and tail pointers were being manipulated directly instead of just having
the padding length added via __skb_put.

Cc: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: Alexander Duyck <alexander.h.duyck@redhat.com>
Acked-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --cc drivers/net/ethernet/intel/e1000/e1000_main.c
Simple merge

diff --cc drivers/net/ethernet/intel/e1000e/netdev.c
Simple merge

diff --cc drivers/net/ethernet/intel/fm10k/fm10k_main.c
Simple merge

diff --cc drivers/net/ethernet/intel/i40e/i40e_txrx.c
Simple merge

diff --cc drivers/net/ethernet/intel/igb/igb_main.c
Simple merge

diff --cc drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
Simple merge

diff --cc drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
Simple merge