net: phy: aquantia: reimplement aqcs109_config_init() as aqr_gen2_config_init()

net: phy: aquantia: reimplement aqcs109_config_init() as aqr_gen2_config_init()

I lack documentation for AQCS109, but from commit 99c864667c9f ("net:
phy: aquantia: add support for AQCS109"), it is known that "From
software point of view, it should be almost equivalent to AQR107."

Based on further conjecture of the device numbering scheme, I am
treating it as similar to AQR109 (a Gen2 PHY capable of to 2.5G).

Its current instructions are also present in other init sequences as
below:
- aqr_wait_reset_complete() ... aqr107_chip_info() as well as
  aqr107_set_downshift() are in aqr_gen1_config_init()
- aqr_gen2_fill_interface_modes() is in aqr_gen2_config_init()

So it would be good to centralize this implementation by just calling
aqr_gen2_config_init().

In practice this completes support for the following features, which are
present on AQR109 already:
- Potentially reverse MDI lane order via "marvell,mdi-cfg-order"
- Restore polarity of active-high and active-low LEDs after reset.

Cc: Nikita Yushchenko <nikita.yoush@cogentembedded.com>
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Link: https://patch.msgid.link/20250821152022.1065237-13-vladimir.oltean@nxp.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>