[NTOSKRNL] Overhaul Cc and Mm relationship

Previously, when creating a file section, Mm requested Cc to cache the file, then Cc would request pages from Mm, then Mm would request them back to serve its file-mapping role
Now, Mm does it all by itself. If file cahcing is requested by the FS driver, then Cc creates a file mapping and uses that to serve its purpose.

This is a rewrite of Cc

ntoskrnl/cache/section/sptab.c

@@ -187,9 +187,6 @@ _MmSetPageEntrySectionSegment(PMM_SECTION_SEGMENT Segment,
     ASSERT(Segment->Locked);
     ASSERT(!IS_SWAP_FROM_SSE(Entry) || !IS_DIRTY_SSE(Entry));
 
-    if (Entry && !IS_SWAP_FROM_SSE(Entry))
-        MmGetRmapListHeadPage(PFN_FROM_SSE(Entry));
-
     PageTable = MiSectionPageTableGetOrAllocate(&Segment->PageTable, Offset);
 
     if (!PageTable) return STATUS_NO_MEMORY;