iwlwifi: increase PNVM load timeout

The FW has a watchdog of 200ms in the PNVM load flow, so the driver
should have a slightly higher timeout.  Change the timeout from 100ms
to 250ms.
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Fixes: 70d3ca86 ("iwlwifi: mvm: ring the doorbell and wait for PNVM load completion")
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Link: https://lore.kernel.org/r/iwlwifi.20210612142637.ba22aec1e2be.I36bfadc28c480f4fc57266c075a79e8ea4a6934f@changeidSigned-off-by: Luca Coelho <luciano.coelho@intel.com>

drivers/net/wireless/intel/iwlwifi/fw/pnvm.h

 /* SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause */
 /******************************************************************************
  *
- * Copyright(c) 2020 Intel Corporation
+ * Copyright(c) 2020-2021 Intel Corporation
  *
  *****************************************************************************/
 
@@ -10,7 +10,7 @@
 
 #include "fw/notif-wait.h"
 
-#define MVM_UCODE_PNVM_TIMEOUT	(HZ / 10)
+#define MVM_UCODE_PNVM_TIMEOUT	(HZ / 4)
 
 int iwl_pnvm_load(struct iwl_trans *trans,
 		  struct iwl_notif_wait_data *notif_wait);