airoha: support openwrt,netdev-name for renaming interfaces

airoha: support openwrt,netdev-name for renaming interfaces

Add support to the airoha target for the OpenWrt-specific DT property
`openwrt,netdev-name`. In particular, this is for interfaces under
non-DSA `airoha_eth` interfaces.

This will avoid conflicts with upstream code[1]; and maintain forward
compatibility with OpenWrt configurations if/when `airoha_eth` becomes
a full DSA driver.

[1] https://lore.kernel.org/netdev/20240709124503.pubki5nwjfbedhhy@skbuf/

Borrowed from d4d6c48 (mediatek: filogic: support openwrt,netdev-name for renaming interfaces)

Signed-off-by: Kenneth Kasilag <kenneth@kasilag.me>
Link: https://github.com/openwrt/openwrt/pull/20475
Signed-off-by: Robert Marko <robimarko@gmail.com>