kernel: qca-ssdk: update to 12.5 for kernel 6.6

kernel: qca-ssdk: update to 12.5 for kernel 6.6

Qualcomm recently committed a new branch (12.5.r2) targeting kernel
6.6. This lets us clean up a few patches particularly the one for
"C22/C45" mdio.

A quick way to see what changed for IPQ807x/6018 was to list the files produced
during build (**/*.o), replace the extension with ".c", and doing a
`git log`.

Filtering from those commits, ones of particular interest are listed
below:

```
2024-04-16 - 0d8f30aa - fix compile issue on hk with linux style build
2024-01-29 - 636464f7 - update the check for port link notify
2024-01-24 - 30c10e7f - enable and disable loopback for xgmac to fix qm stuck issue
2024-01-15 - b6ea10aa - update the the APIs to access switch
2024-01-08 - a1687502 - Disable Tx bridge mac before power off the PHY
2024-01-07 - 3eafb613 - support led configure for malibu phy
2024-01-07 - 5c1af60d - remove phy type check from mac reset when mode switch
2023-12-17 - 79d0b1e8 - remove the PHY access APIs in ssdk_plat.c
2023-12-16 - b2953740 - Update mii read/write functions
2023-12-11 - 37f2eac3 - add port id check for fdb entry
2023-12-11 - d040ca4d - support mdio clause45 on kernel6.6
2023-12-07 - 11494fbc - use barrier mw() during access fdb entry table
2023-12-03 - 8e40a284 - fix build warnings on kernel6.6
2023-11-10 - 10aa0a02 - change speed value when call ssdk_port_link_notify
2023-11-06 - ee4c4a60 - Update mac bitmap value of L3 table on MAC delete
2023-11-03 - 7cd27d39 - support 10G phy common feature
2023-10-30 - 383cc0d2 - fix mactype and mux select issue
2023-10-24 - decf534a - support autoneg status query on force port
2023-10-11 - 111d574e - move ssdk_led_init to regi_init
2023-10-08 - 6b14c142 - the combo port also need to parse SFP pins
2023-10-03 - fb2e0401 - fix port5 interface mode switch issue in erp case
```

Verified with users on QNAP 301W, NBG7815, and myself on Dynalink
DL-WRX36 that everything is functional, including LEDS.

Signed-off-by: Sean Khan <datapronix@protonmail.com>
Link: https://github.com/openwrt/openwrt/pull/15379
Signed-off-by: Robert Marko <robimarko@gmail.com>