module/atu: add driver module for address translation unit
Created by: shriram-k-arm
The Address Translation Unit(ATU) provides means to convert the logical address (32 bit LA) from the MSCP memory space to the physical address residing in the system memory.
Add a driver module for the ATU that provides an interface for modules to request a translation region to be mapped, unmapped or output bus attributes to be configured during the runtime phase.
Change-Id: Ic9bf58cf75c74ecc2d760e041369f3df824e1efa