Integrate meta-seco-rk/ap/remove-existing-patch

Commit: edgehog/layers/seco/meta-seco-rk@3334ba7d

[C31][UBOOT] remove already-existing patch

Remove patch 0006-Add-target-to-generate-initial-environment.patch, which was already committed to branch next of u-boot-seco-rk Commit: cbca032016b0cfad1527abbe05c3696c32834ba5

This fixes a bitbake error when trying to modify u-boot-seco-rk (C31) with devtool