Change CONFIG_NET_RECEIVE_WONDOW to CONFIG_NET_ETH_TCP_RECVWNDO or CONFIG_NET_SLIP_TCP_RECVWNDO in all defconfig files

EFM32 USART setup: Computation of BAUD includes shift; Eliminate additional shift.  From  Pierre-noel Bouteville

Network: netdev_register() must assign the device name appropriately according to the link layer type

Network:  All logic will now handle varialbe length link layer protocol headers within incoming packets.  This permits use of multiple network interfaces with differing data links.  For example, ETHERNET + SLIP

Netwoek:  Ada a parameter to netdev_register() to indicate the link protocol supported by the driver.  Use this value to replace some logic commited yesterday

Add mirror (x/y) and inverse video (black<->white) options to the ST7565 LCD driver.  From  Pierre-noel Bouteville.