net: dsa: netc: introduce NXP NETC switch driver for i.MX94

For i.MX94 series, the NETC IP provides full 802.1Q Ethernet switch
functionality, advanced QoS with 8 traffic classes, and a full range of
TSN standards capabilities. The switch has 3 user ports and 1 CPU port,
the CPU port is connected to an internal ENETC. Since the switch and the
internal ENETC are fully integrated within the NETC IP, no back-to-back
MAC connection is required. Instead, a light-weight "pseudo MAC" is used
between the switch and the ENETC. This translates to lower power (less
logic and memory) and lower delay (as there is no serialization delay
across this link).

Introduce the initial NETC switch driver with basic probe and remove
functionality. More features will be added in subsequent patches.

Signed-off-by: Wei Fang <wei.fang@nxp.com>
Link: https://patch.msgid.link/20260518082506.1318236-11-wei.fang@nxp.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

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