vmlinux cleanup

This series of patches is made in purpose to use PAGE_SIZE and THREAD_SIZE macroses in vmlinux linker scripts as much as possible instead of numeric constants. Please review.

WARNING: the patches are UNTESTED COMPLETELY - I've no access to that architectures and errors is highly possible ;)

If you have an ability to test this patches - please do it. What is most important on review - these macroses *must* be placed into appropriate places - check it please.

ANY comments are welcome.

- Cyrill -