Fix uwe5622 "spanning-writes" warning messages in dmesg

[paolosabatino]

Description

Spreadtrum/Unisoc wifi uwe5622 driver is producing a lot of warning messages with consequent kernel dumps in dmesg when run with a recent kernel. The driver is functional, but the kernel complaints.

This PR will fix the problem with kernel >= 6.12 using DECLARE_FLEX_ARRAY() macro in place of u8 data[0] flexible array declarations that are causing the warnings. Note that this probably could be applied to older kernels as well, since the DECLARE_FLEX_ARRAY() macro is available from 5.15 onwards.

This applies to both rockchip64 (OrangePi 4 LTS uses this part), but also to some sunxi boards.

GitHub issue reference:
Jira reference number AR-2574

How Has This Been Tested?

• Compiled rockchip64 edge 6.13-rc4 kernel debs and tested on a live installation
• Compiled rockchip64 current 6.12 kernel debs and tested on a live installation
• iperf3 benchmarks, performance is ok
• ssh tests, connectivity is ok

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings