Kernel: Don't truncate physical address in ACPI table to 32 bits

We need to cast physical addresses to PhysicalPtr instead of FlatPtr,
which is currently always 64 bits. However, if one day we were to
support 32 bit non-pae mode then it would also truncate appropriately.

Kernel/ACPI/Parser.cpp

@@ -408,8 +408,8 @@ UNMAP_AFTER_INIT static PhysicalAddress search_table_in_xsdt(PhysicalAddress xsd
     auto xsdt = map_typed<Structures::XSDT>(xsdt_address);
 
     for (size_t i = 0; i < ((xsdt->h.length - sizeof(Structures::SDTHeader)) / sizeof(u64)); ++i) {
-        if (match_table_signature(PhysicalAddress((FlatPtr)xsdt->table_ptrs[i]), signature))
-            return PhysicalAddress((FlatPtr)xsdt->table_ptrs[i]);
+        if (match_table_signature(PhysicalAddress((PhysicalPtr)xsdt->table_ptrs[i]), signature))
+            return PhysicalAddress((PhysicalPtr)xsdt->table_ptrs[i]);
     }
     return {};
 }
@@ -431,8 +431,8 @@ UNMAP_AFTER_INIT static PhysicalAddress search_table_in_rsdt(PhysicalAddress rsd
     auto rsdt = map_typed<Structures::RSDT>(rsdt_address);
 
     for (u32 i = 0; i < ((rsdt->h.length - sizeof(Structures::SDTHeader)) / sizeof(u32)); i++) {
-        if (match_table_signature(PhysicalAddress((FlatPtr)rsdt->table_ptrs[i]), signature))
-            return PhysicalAddress((FlatPtr)rsdt->table_ptrs[i]);
+        if (match_table_signature(PhysicalAddress((PhysicalPtr)rsdt->table_ptrs[i]), signature))
+            return PhysicalAddress((PhysicalPtr)rsdt->table_ptrs[i]);
     }
     return {};
 }