dev: Get PageBytes from the system in the ide_disk model.

This avoids having to use TheISA::.

Change-Id: I020860ab343f9b6fafbcb0e23479d0b64f094512
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/22268
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Jason Lowe-Power <jason@lowepower.com>
Maintainer: Jason Lowe-Power <jason@lowepower.com>

src/dev/storage/ide_ctrl.cc

@@ -124,7 +124,7 @@ IdeController::IdeController(Params *p)
             panic("IDE controllers support a maximum "
                   "of 4 devices attached!\n");
         }
-        params()->disks[i]->setController(this);
+        params()->disks[i]->setController(this, sys->getPageBytes());
     }
 
     primary.select(false);