ste board description and implementation-11.12

Headline:
Enable device tree support for sound and video ST-E boards

Acceptance:
ST-E boards will boot correctly with the DT enabled and the boards devices would function correctly.

Plan details:
[niklas-hernaeus]Serial: INPROGRESS
 - add dt to generic serial prime cell
   * Implicitly done
 - adjust board file:
    Platform data needs to be added.
 - Add to dts file: Done
 - test - 1h
[LeeJones 08/03/12] This is complete, tested and working

[niklas-hernaeus]MMC: TODO
 - add dt to mmc files
   * Investigation - 12h
   * Comment: Someone else is said to have done this.
      Currently tracking down that person.
 - adjust board file
 - Add to dts file: Done
 - test - 1h

[niklas-hernaeus]SPI: TODO
 - add dt to spi files
   * Investigation - 10h
   * Add dt functionality - 4h
 - adjust board file
   * Investigation - 2h
   * Add dt stuff - 4h
 - Add to dts file
 - test - 1h
[LeeJones 08/03/12] This is complete, tested and working

[niklas-hernaeus]I2C: TODO
 - add dt to i2c files
   * Investigation - 8h
   * Add dt functionality - 4h
 - adjust board file
   * Investigation - 8h
   * Add dt stuff - 4h
 - Add to dts file: Done
 - test - 1h

[lee-jones]Irq driver: Done
 - add dt to irq files: Done
 - adjust board file: Done
 - add to snowball DT file: Done
 - test - 1h

Also see Lee Jones blueprint at:
https://blueprints.launchpad.net/igloocommunity/+spec/ste-lt-implement-device-tree-on-snowball

[niklas-hernaeus]Add DT support to sound driver(s): TODO
[niklas-hernaeus]Add DT support to video driver (will wait for new driver): TODO
[niklas-hernaeus]Write and test DT board description for st-ericsson eval board: TODO
[niklas-hernaeus]Create merged board support for eval board and other platforms: TODO