linux-postmarketos-rockchip: upgrade to 6.6.34
I did it in 2 steps:
- change pkgver
- pmbootstrap kconfig migrate linux-postmarketos-rockchip
We had a few attempts to upgrade this before and it didn't work out, I suggest to follow 2 conditions here:
- let's not start kernel config from scratch if possible, so we don't lose the progress of device porting
- let's stick to 6.6.x LTS, this way even if we get stuck again we will at least be able to upgrade it to minor releases