net: enetc: remove the mm_lock from the ENETC v4 driver

Currently, the ENETC v4 driver has not added the MAC merge layer support
in the upstream, so the mm_lock is not initialized and used, so remove
the mm_lock from the driver.

Fixes: 99100d0 ("net: enetc: add preliminary support for i.MX95 ENETC PF")
Cc: [email protected]
Signed-off-by: Wei Fang <[email protected]>
Reviewed-by: Vladimir Oltean <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>

Author: Wei Fang

drivers/net/ethernet/freescale/enetc/enetc4_pf.c

@@ -672,7 +672,6 @@ static int enetc4_pf_netdev_create(struct enetc_si *si)
 err_alloc_msix:
 err_config_si:
 err_clk_get:
-	mutex_destroy(&priv->mm_lock);
 	free_netdev(ndev);
 
 	return err;