net: phy: aquantia: merge and rename aqr105_read_status() and aqr107_read_status()

aqr105_read_status() and aqr107_read_status() are very similar.
In fact, they are identical, save from a code snippet accessing a Gen2
feature (rate adaptation), placed at the end of aqr107_read_rate(), and
absent from aqr105_read_rate().

The code structure is:

aqr105_read_status()                        aqr107_read_status()
-> aqr105_read_rate()                       -> aqr107_read_rate()

After the recent change "net: phy: aquantia: use cached GLOBAL_CFG
registers in aqr107_read_rate()", it is absolutely trivial to
restructure the code as follows:

aqr_gen2_read_status()
-> aqr_gen1_read_status()
-> Gen2-specific stuff (read GLOBAL_CFG registers to set rate_matching)

Doing so reduces code duplication.

Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Link: https://patch.msgid.link/20250821152022.1065237-10-vladimir.oltean@nxp.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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