Fix 2 bugs in the mpc85xx local bus controller driver.

1. Include opt_platform.h to get QORIQ_DPAA. Otherwise the definition of

OCP85XX_TGTIF_LBC is incorrect.

2. The child resources are already allocated, just activate them, instead of

incorrectly remapping the memory regions (resource lists for lbc consist of the
virtual address of the child's resources, not the physical address).

Sponsored by: Alex Perez/Inertial Computing