iwlwifi: mvm: remove unneeded reg write in iwl_mvm_up()

Not only that this write is not needed (as FW does this
itself), on newer HW this register is write protected
so trying to write there will cause problems.
Signed-off-by: Liad Kaufman <liad.kaufman@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>

drivers/net/wireless/intel/iwlwifi/iwl-prph.h

@@ -294,9 +294,6 @@
 
 /*********************** END TX SCHEDULER *************************************/
 
-/* tcp checksum offload */
-#define RX_EN_CSUM		(0x00a00d88)
-
 /* Oscillator clock */
 #define OSC_CLK				(0xa04068)
 #define OSC_CLK_FORCE_CONTROL		(0x8)

drivers/net/wireless/intel/iwlwifi/mvm/fw.c

@@ -1475,10 +1475,6 @@ int iwl_mvm_up(struct iwl_mvm *mvm)
 			goto error;
 	}
 
-	if (iwl_mvm_is_csum_supported(mvm) &&
-	    mvm->cfg->features & NETIF_F_RXCSUM)
-		iwl_trans_write_prph(mvm->trans, RX_EN_CSUM, 0x3);
-
 	/* allow FW/transport low power modes if not during restart */
 	if (!test_bit(IWL_MVM_STATUS_IN_HW_RESTART, &mvm->status))
 		iwl_mvm_unref(mvm, IWL_MVM_REF_UCODE_DOWN);