Device Tree port

Implemented:

• irq handler
• uart0 (pl011)
• watchdog

https://github.com/bootc/linux/commits/rpi02-plat

TODO:

• remove clock.c/clock.h?
• clkdev (when it gains dt support)
• gpio
• gpio irq
• ok-led (needs gpio)
• vcio
• fb (needs vcio)
• dma
• power
• usb (needs dma, power, hack in the current dwc_otg code until a proper driver is merged)
• ethernet mac address
• mmc/emmc (aka sdhci, needs dma, power)
• pinmux (needed by everything that uses a configurable pin)
• spi
  • https://github.com/bootc/linux/commits/rpi-spi
• spi irq
• spi dma
• i2c
• i2c irq
• i2c dma
• audio
• pwm
• vc-mem
• vchiq (aka vc04/vcos)