Tiva PHY Interrupts: Need to read the PHY interrupt status register in order to clear the pending PHY interrupt

Tiva Ethernet: Removed logic that holds the PHY and re-ordered some reset logic.  Can not ping the DK

Tiva serial:  Add volatile to fix a wait loop that was not waiting; CR really should preced LF in CR-LF expansion

net/tcp/tcp_conn.c:  Fix a logic error when CONFIG_NETDEV_MULTINIC is selected: net_unlock(flags) will be called will an uninitialized variable (2015-01-03).

Some boards do not have the external 32khz oscillator installed, for those boards we must fallback to the crummy to the crummy internal RC clock.  Turn on by defining CONFIG_RTC_LSICLOCK.

From Kevin Hester <kevinh@geeksville.com> via Lorenz Meier.

There were some changes which broke my NuttX-Build. With these two patches it builds again.  From Manuel Stühn

Tiva Ethernet: Integrate use of workqueue so the network processing is not done at the interrupt level