ARM: shmobile: koelsch: make i2c2-pfc node unique

This node should have a unique name so it can be distinguished when
other i2c busses are added later.

Signed-off-by: Wolfram Sang <wsa@sang-engineering.com>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: Magnus Damm <damm@opensource.se>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>