MMCSD SDIO:  Add support for a new SDWAIT_WRCOMPLETE condition.  The previous logic used a busy-wait loop to pool the card R1 start to determine when the card was ready for the next transfer.  That busy-wait can be quite long -- hundreds of milliseconds.  And alternative is to look the the SD D0 pin which will change state when the card is no longer busy.

This logic implements a change the avoids the busy-wait poll by reconfiguring the SD D0 pin as a GPIO interrupt, then waiting for the card to becom ready without taking up CPU cycles.

This change is conditioned on CONFIG_MMCSD_SDIOWATI_WRCOMPLETE and is currenlty only implemented for the STM32 SDIO driver.

From David Sidrane

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