Integrate meta-guf-machine/cherry-pick-2a8b2f2c

Commit: https://git.seco.com/seco-ne/yocto/layers/meta-guf-machine/-/commit/2bdd1ee76cc7272a93d769901609c3891150ff3d

kernel: Set default Kernel for i.MX6 to 5.15.29

(cherry picked from commit 2a8b2f2ccc723ad8c879f4179006cd45ecae8a81)