Bump rockchip armhf edge kernel to 7.0.0

[paolosabatino]

Description

Regular rockchip armhf edge kernel bump to 7.0.0-rc6, with fixed/updated patches.
Hopefully with -rc7 there won't be any patch mainlining.

GitHub issue reference:
Jira reference number AR-2849

How Has This Been Tested?

• Tested on a live installation on rk322x target
• Tested a freshly built Debian Trixie minimal image on rk3288 Asus Tinkerboard

With both device basic peripherals (HDMI, Ethernet, USB2) were tested and work fine.

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• My changes generate no new warnings

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[github-actions]

✅ This PR has been reviewed and approved — all set for merge!