ARM: at91: Add at91sam9n12 and refence booard
* tag 'at91-for-next-soc' of git://github.com/at91linux/linux-at91:
ARM: at91: Add DT description files for AT91SAM9N12-EK
ARM: at91: Add machine files for AT91SAM9N12 SoC
ARM: at91: Add machine header file for AT91SAM9N12 SoC
Based on at91/dt branch.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>