vm_manager: Migrate MemoryInfo and PageInfo to vm_manager.h

Gets the two structures out of an unrelated header and places them with
the rest of the memory management code.

This also corrects the structures. PageInfo appears to only contain a
32-bit flags member, and the extra padding word in MemoryInfo isn't
necessary.

src/core/hle/kernel/svc.h

@@ -8,22 +8,6 @@
 
 namespace Kernel {
 
-struct MemoryInfo {
-    u64 base_address;
-    u64 size;
-    u32 type;
-    u32 attributes;
-    u32 permission;
-    u32 device_refcount;
-    u32 ipc_refcount;
-    INSERT_PADDING_WORDS(1);
-};
-static_assert(sizeof(MemoryInfo) == 0x28, "MemoryInfo has incorrect size.");
-
-struct PageInfo {
-    u64 flags;
-};
-
 void CallSVC(u32 immediate);
 
 } // namespace Kernel