SAMA5D4:  More progress on XDMAC driver (still no complete); Also fixes some critical errors in the SAMA5D3 DMA definitions
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SAMA5D4: XDMAC driver now compiles error/warning free (still untested)
Cosmetic cleanup
Notify Ethernet driver of TX data availability on raw socket.  From Daniel Lazlo Sitzer
Raw sockets:  Various fixes for closing, free connections, TX from Daniel Lazo Sitzer
Raw sockets:  Various fixes for closing, free connections, TX from Daniel Lazo Sitzer
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Move TCP files from net/uip to net/tcp
Move TCP files from net/uip to net/tcp
Move uip/uip_listen.c to tcp/tcp_listen.c
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Move UDP files from net/uip to net/udp
Move Packet files from net/uip to net/pkt
Networking:  Move relevant parts of net/Kconfig to tcp/Kconfig, udp/Kconfig, and pkt/Kconfig
SAMA5D4:  Fix ISRAM base address:  0x00200000, not like the SAMA5D3 SRAM at 0x00300000
Costmetic update to comments/README file
Fix file names in new net/pkt/Make.defs
Costmetic changes after review for sense of OK (should be zero)
Add missing CONFIG_NET_GUARDSIZE to Kconfig