Merge "Add kcmdlinectrl for setting the kcmdline bootloader message" into main am: d318ab3e1f am: 21dda9444e

Original change: https://android-review.googlesource.com/c/platform/system/extras/+/2908345

Change-Id: Ie15787646812ad3667916e3797cc8195d79603bc
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>