arm: at91: add at91sam9n12 register definition

Since at91sam9n12 is a subset of at91sam9x5, so put all at91sam9n12
definitions in at91sam9x5 head file.

Signed-off-by: Josh Wu <josh.wu@atmel.com>
Signed-off-by: Andreas Bießmann <andreas.devel@googlemail.com>
4 files changed