Positron kernel for veux/peux

Meet Positron — the 1st custom kernel for veux!

Changes from stock:

* Rebased over LA.UM.9.14.r1-22000 and ASB-2023-07-05_11-5.4

Upstream branches contain fixes for various bugs and, what's even more important, for security vulnerabilities.

* Longer UFS life

Stock kernel enables UFS WriteBooster by default. This feature enhances write performance but affects endurance. Because of the latter part (green activists should be really mad now), WB is disabled here.

* No debug features

Debugging is an essential part of development process but on production devices it just slows things down.