ARM: mvebu: enable i2c device in mvebu_v7_defconfig

This commit enables user-space access to I2C bus using char device.

Signed-off-by: Marcin Wojtas <mw@semihalf.com>
Reviewed-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
Acked-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Acked-by: Andrew Lunn <andrew@lunn.ch>
Link: https://lkml.kernel.org/r/1415980652-7429-6-git-send-email-mw@semihalf.com
Signed-off-by: Jason Cooper <jason@lakedaemon.net>