net: enetc: differentiate phylink capabilities for pseudo-MAC and standalone MAC

The ENETC pseudo-MACs are proprietary internal links that do not
implement any standard MII interface, so restrict their supported PHY
interface modes to PHY_INTERFACE_MODE_INTERNAL only.

Since pseudo-MACs can operate at any speed between 10Mbps and 25Gbps
in multiples of 10Mbps, set their MAC capabilities to cover the full
range of standard full-duplex speeds: 10/100/1000/2500/5000/10000/
20000/25000 Mbps.

For standalone ENETC (v4), expand the supported interface modes to
include 10GBASER in addition to the existing RGMII, SGMII, 1000BASEX,
2500BASEX and USXGMII modes, with MAC capabilities up to 10G. MAC_1000
is replaced with MAC_1000FD to explicitly exclude 1000M half-duplex,
which is not supported.

Note that 10GBASE-R mode of ENETC v4 has not supported yet, the current
patch adds PHY_INTERFACE_MODE_10GBASER simply as preparation for the
upcoming support of the 10GBASE-R mode.

Signed-off-by: Claudiu Manoil <claudiu.manoil@nxp.com>
Signed-off-by: Wei Fang <wei.fang@nxp.com>
Reviewed-by: Maxime Chevallier <maxime.chevallier@bootlin.com>
Link: https://patch.msgid.link/20260720014317.1059359-8-wei.fang@oss.nxp.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>