Draft: linux-postmarketos-qcom-sm8150: update to v6.13-sm8150 and takeover mantainership

This mr updates linux-postmarketos-qcom-sm8150 to v6.13-sm8150, so it removes linux-postmarketos-qcom-sm8150-nabu, it also updates the device-xiaomi-nabu to use the linux-postmarketos-qcom-sm8150, it is marked as draft because i still need to polish the xiaomi-vayu changes (not yet in the repo), so we don't remove any device, it will be a draft until it is tested in that device

rc: @caleb @alexeymin