For Cortex A8, and ARM1176JZF clean cache lines of altered MMU translation tables. Fix #1194
The central security regions has to be mapped when starting the hw-kernel on the i.MX53 and using the TrustZone mechanisms. Ref #1182
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