Define the Henninger board dependent part of the I2C2 device node.

Based on the Koelsch I2C2 device tree patch by Wolfram Sang.
Signed-off-by: NSergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Signed-off-by: NSimon Horman <horms+renesas@verge.net.au>