On the Versatile Express Cortex A9x4 platform the first memory region
0x0 - 0x4000000 is a hardware remapped memory area, containing flash
and DDR RAM copies and thus should not be added in addition to all
DDR RAM regions and the SRAM region.
This patch changes the top-level directory layout as a preparatory
step for improving the tools for managing 3rd-party source codes.
The rationale is described in the issue referenced below.
Issue #1082