ucc_geth: Fix MODULE_DEVICE_TABLE() duplication

Fix MODULE_DEVICE_TABLE() duplication in ucc_geth.c and ucc_geth_mii.c
for ucc_geth to be compiled as module.

Signed-off-by: Li Yang <leoli@freescale.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>