lib: avl: Add option to find close to key value

This can be used for quick searching in a key environment. Further
abstractions might be required in the future to make this a clean
solution though.

Signed-off-by: Bart Kuivenhoven <bemkuivenhoven@gmail.com>
mm: page_fault: Add the first bit of permissions

Signed-off-by: Bart Kuivenhoven <bemkuivenhoven@gmail.com>