Merge pull request #10905 from maribu/packet_size_l2_pdu

cpu/esp_common/esp-now/esp_now_netdev.c

cpu/nrf5x_common/radio/nrfmin/nrfmin.c

drivers/cc110x/cc110x-netdev.c

drivers/netdev_eth/netdev_eth.c

drivers/netdev_ieee802154/netdev_ieee802154.c

drivers/sx127x/sx127x_netdev.c

drivers/xbee/xbee.c

sys/include/net/netopt.h

sys/net/crosslayer/netopt/netopt.c

sys/net/gnrc/application_layer/tftp/gnrc_tftp.c

sys/net/gnrc/netif/gnrc_netif.c

sys/net/gnrc/netif/gnrc_netif_device_type.c

sys/shell/commands/sc_gnrc_netif.c

tests/driver_at86rf2xx/cmd.c

tests/gnrc_ipv6_nib/main.c

tests/gnrc_ipv6_nib/mockup_netif.c

tests/gnrc_ipv6_nib_6ln/main.c

tests/gnrc_ipv6_nib_6ln/mockup_netif.c

tests/gnrc_ndp/main.c

tests/gnrc_netif/common.c