arch/xtensa/esp32:espnow pktradio simplify addressing

Modify addressing to allow only 2 byte node address.
Allow modifying the node address by modifying the ipv6 address
(the ipv6 address has a direct relation with the node address)
Introduce the option to add a 4 byte random number to the mac header
as a preparation for ciphered data exchange.
Introduce a FCB (frame control byte) as a replacement for the INFO
field in the mac header.
Update esp32-devkitc:espnow config to reflect address size change.
Update the documentation to reflect address size changes.

Signed-off-by: Laczen JMS <laczenjms@gmail.com>

boards/xtensa/esp32/esp32-devkitc/configs/espnow/defconfig

@@ -28,10 +28,6 @@ CONFIG_DEV_URANDOM=y
 CONFIG_DRIVERS_IEEE80211=y
 CONFIG_DRIVERS_WIRELESS=y
 CONFIG_ESP32_ESPNOW_PKTRADIO=y
-CONFIG_ESP32_ESPNOW_PKTRADIO_NODE_ADDR_0=0x0a
-CONFIG_ESP32_SPIFLASH=y
-CONFIG_ESP32_SPIFLASH_SPIFFS=y
-CONFIG_ESP32_STORAGE_MTD_SIZE=0x80000
 CONFIG_ESP32_UART0=y
 CONFIG_ESPRESSIF_WIFI=y
 CONFIG_EXAMPLES_UDP=y
@@ -39,6 +35,7 @@ CONFIG_EXAMPLES_UDP_DEVNAME="wpan0"
 CONFIG_EXAMPLES_UDP_IPv6=y
 CONFIG_EXAMPLES_UDP_SERVER1=y
 CONFIG_EXAMPLES_UDP_TARGET2=y
+CONFIG_FS_LARGEFILE=y
 CONFIG_FS_PROCFS=y
 CONFIG_IDLETHREAD_STACKSIZE=3072
 CONFIG_INIT_ENTRYPOINT="nsh_main"
@@ -51,9 +48,8 @@ CONFIG_NETDB_DNSCLIENT=y
 CONFIG_NETDB_DNSCLIENT_NAMESIZE=64
 CONFIG_NETDEV_LATEINIT=y
 CONFIG_NETDEV_PHY_IOCTL=y
-CONFIG_NETDEV_TELNET=y
 CONFIG_NETDEV_WIRELESS_IOCTL=y
-CONFIG_NETUTILS_CJSON=y
+CONFIG_NETUTILS_TELNETD=y
 CONFIG_NET_6LOWPAN=y
 CONFIG_NET_BROADCAST=y
 CONFIG_NET_ETH_PKTSIZE=1518
@@ -62,13 +58,13 @@ CONFIG_NET_IPv6=y
 CONFIG_NET_PREALLOC_DEVIF_CALLBACKS=32
 CONFIG_NET_STATISTICS=y
 CONFIG_NET_TCP=y
-CONFIG_NET_TCP_DELAYED_ACK=y
 CONFIG_NET_TCP_WRITE_BUFFERS=y
 CONFIG_NET_UDP=y
 CONFIG_NSH_ARCHINIT=y
 CONFIG_NSH_BUILTIN_APPS=y
 CONFIG_NSH_FILEIOSIZE=512
 CONFIG_NSH_READLINE=y
+CONFIG_PKTRADIO_ADDRLEN=2
 CONFIG_POSIX_SPAWN_DEFAULT_STACKSIZE=2048
 CONFIG_PREALLOC_TIMERS=4
 CONFIG_PTHREAD_MUTEX_TYPES=y
@@ -79,20 +75,17 @@ CONFIG_RR_INTERVAL=200
 CONFIG_SCHED_LPWORK=y
 CONFIG_SCHED_WAITPID=y
 CONFIG_SIG_DEFAULT=y
-CONFIG_SPI=y
-CONFIG_SPIFFS_NAME_MAX=48
 CONFIG_START_DAY=6
 CONFIG_START_MONTH=12
 CONFIG_START_YEAR=2011
 CONFIG_SYSLOG_BUFFER=y
 CONFIG_SYSLOG_CONSOLE=y
-CONFIG_SYSTEM_ARGTABLE3=y
 CONFIG_SYSTEM_DHCPC_RENEW=y
 CONFIG_SYSTEM_NSH=y
+CONFIG_SYSTEM_TELNET_CLIENT=y
 CONFIG_TLS_TASK_NELEM=4
 CONFIG_UART0_SERIAL_CONSOLE=y
 CONFIG_WIRELESS=y
 CONFIG_WIRELESS_PKTRADIO=y
 CONFIG_WIRELESS_WAPI=y
 CONFIG_WIRELESS_WAPI_CMDTOOL=y
-CONFIG_WIRELESS_WAPI_INITCONF=y