[NTOS:CC] CcWriteVirtualAddress(): Do not round 'Size'

Revert 'Properly align VACB writes' part of 2a80ae2bb6.

CORE-15384 CORE-16018

ntoskrnl/cc/copy.c

@@ -178,7 +178,6 @@ CcWriteVirtualAddress (
         } while (++i < (Size >> PAGE_SHIFT));
     }
 
-    Size = ROUND_TO_PAGES(Size);
     ASSERT(Size <= VACB_MAPPING_GRANULARITY);
     ASSERT(Size > 0);