Fixes to IDE disk to fix serialization. Now passes simple CPU serialize

tests

dev/ide_ctrl.cc:
    Formatting
dev/ide_disk.cc:
    Remove some junk, add an assert to serialize, and add missing serialize
    for command register.

--HG--
extra : convert_revision : 8f99857e32f278dd4e6f23deffc8047c6411d5b2

dev/ide_ctrl.cc

@@ -656,6 +656,7 @@ IdeController::unserialize(Checkpoint *cp, const std::string &section)
     UNSERIALIZE_SCALAR(io_enabled);
     UNSERIALIZE_SCALAR(bm_enabled);
     UNSERIALIZE_ARRAY(cmd_in_progress, 4);
+
     if (pioInterface) {
         pioInterface->addAddrRange(pri_cmd_addr, pri_cmd_addr +
                                    pri_cmd_size - 1);