defconfig:
- update kirkwood_defconfig via 'make oldconfig'
- Add all Kirkwood DT boards to the defconfig
- enable SERIAL_OF_PLATFORM and ORION_WATCHDOG in kirkwood_defconfig
* 'kirkwood/defconfig' of git://git.infradead.org/users/jcooper/linux:
ARM: Kirkwood: add DT boards to defconfig
ARM: Kirkwood: update defconfig