linux-postmarketos-rockchip: upgrade to 6.6.114

Sebastian Fleerrequested to merge
sepp/pmaports:bump-linux-rockchip-6.6 into master

Tested on an Acer Chromebook Tab 10 (google-dru).

Originally I wanted to directly upgrade to 6.12, but I got panel problems with 6.12. So I decided to push this upgrade first until I figured out how to proceed with 6.12.

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