ARM: shmobile: bockw: enable I2C in defconfig

Enable I2C driver in 'bockw_defconfig'.

Signed-off-by: Vladimir Barinov <vladimir.barinov@cogentembedded.com>
Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Acked-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
[ horms+renesas@verge.net.au: resolved trivial conflicts ]
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>