Upgrade PinePhonePro kernel to 6.0.x

Follow up on the PPP kernel upgrading discussion in !3552 (comment 1137589108).

From @a-wai:

It has all our patches (minux mobian-specific stuff) on top of 6.0.2

It should also be in sync with megi's PPP drivers, but back camera doesn't work however

Also @calebccff just updated the pine64-org linux fork here: https://gitlab.com/pine64-org/linux/-/tree/pine64-kernel-ppp-6.0.y (I'm not sure what this means actually, rebased previous patches on top of 6.0.2? according to the Makefile this is 6.0.2.)

So... I guess now we have 3 trees. I didn't take a look at them in detail.

@PsychoGame, do you want to take a look at these and prepare a MR to upgrade the kernel? Is there anything that you would recommend we add to the pine64-org tree?

Does anyone have an idea how we can establish a process to keep it updated in the future?

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