Kernel: Implement ScatterList for handling scattered DMA pages

This class is used in the AHCI code to handle a big request of
read/write to the disk. If we happen to encounter such request,
we will get the needed amount of physical pages from the
already-allocated physical pages in AHCIPort, and with that we
will create a ScatterList that will create a Region that maps
all of these pages in a contiguous virtual memory range.

Then, we could easily copy to/from this range, before and after
calling the operation on the StorageDevice as needed with
read or write operations.

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