[NTOS]: Use system PTEs for drivers, both boot drivers and system-loaded drivers...

[NTOS]: Use system PTEs for drivers, both boot drivers and system-loaded drivers. This removes the last user of the deprecated MmAllocateSection internal API. Another side-effect is that drivers will now have much higher load addresses (in the 0xF0000000 and higher range), as you would expect on Windows, plus increasing coverage and usage of system PTEs (which can still be optimized).
[NTOS]: Do not "copy" boot drivers from one set of pages to another set of pages. Instead, use system PTEs to map the boot drivers to a new VA, and set the PFNs to the original PFNs that the loader had obtained (and don't free that memory). This avoids some overhead.
[NTOS]: Now the only user of MmMapMemoryArea is the caching code, which I won't touch.

svn path=/trunk/; revision=45641