TM4C129X Timer:  Add some missing addresses and some of the register bit definitions.  Still incomplete

TM4C129X Timer:  Update addresses in the timer register definitions file.  Still missing bit field definitions

Tiva IRQs:  Fix IRQ control logic; was limited to only 64 IRQs.  That is a problem for higher numbered IRQs on many platforms

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

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.

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

Tiva Ethernet:  First cut at TM4C129X Ethernet driver.  Initial commit is basically just the STM32 Ethernet driver with modifications for a clean compilation in the Tiva environment