uboot-imx

MPC8568E-MDS: reset UCCs to use them reliably

In order to use GETH1 and GETH2 on the MPC8568E-MDS, we should reset
UCCs.

p.s Similar code exists in the Linux kernel board file (for capability
reasons with older U-Boots), but should be removed some day.

Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com>