After r256961 ofw_iicbuc.c will be built for any kernel which includes
options 'iicbus' and 'fdt'.  Remove the (now) unnecessary entries.

Verified on BBB (am335x), EFIKA_MX (imx51 - by ray@), DIGI-CCWMX53
(imx53 - kernel build).

Approved by:	adrian (mentor)