Enable i2c driver for efm32. The other two changes are just results from
oldconfig after commits
- 08b964ff3c51 (ARM: 8198/1: make kuser helpers depend on MMU)
- 8357041a69b3 (of: remove /proc/device-tree)
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Signed-off-by: Olof Johansson <olof@lixom.net>