net: phy: aquantia: fill supported_interfaces for all aqr_gen2_config_init() callers

net: phy: aquantia: fill supported_interfaces for all aqr_gen2_config_init() callers

Since aqr_gen2_config_init() and aqr_gen2_fill_interface_modes() refer to
the feature set common to the same generation, it means all callers of
aqr_gen2_config_init() also support the Global System Configuration
registers at addresses 1E.31B -> 1E.31F, and these should be read by the
driver to figure out the list of supported interfaces for phylink.

This affects the following PHYs supported by this driver:
- Gen2: AQR107
- Gen3: AQR111, AQR111B0
- Gen4: AQR114C, AQR813.

AQR113C, a Gen4 PHY, has unmodified logic after this change, because
currently, the aqr_gen2_fill_interface_modes() call is chained after
aqr_gen2_config_init(), and after this patch, it is tail-called from the
latter function, leading to the same code flow.

At the same time, move aqr_gen2_fill_interface_modes() upwards of its
new caller, aqr_gen2_config_init(), to avoid a forward declaration.

Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Link: https://patch.msgid.link/20250821152022.1065237-6-vladimir.oltean@nxp.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>