net: enetc: convert ndo_set_rx_mode() to ndo_set_rx_mode_async()

The current ndo_set_rx_mode() is called under netif_addr_lock spinlock
with BHs disabled, which prevents drivers from sleeping. To work around
this limitation, the enetc driver uses a dedicated workqueue to defer
MAC address list updates to a sleepable context.

Since commit 3554b4345d85 ("net: introduce ndo_set_rx_mode_async and
netdev_rx_mode_work") introduced the ndo_set_rx_mode_async() callback,
drivers can now handle address list updates directly in a sleepable
context.

Therefore, convert the enetc driver to use ndo_set_rx_mode_async() and
remove the dedicated workqueue and the deferred work item accordingly.

Signed-off-by: Wei Fang <wei.fang@nxp.com>
Link: https://patch.msgid.link/20260720014317.1059359-4-wei.fang@oss.nxp.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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