build-dtb-image: recurse vendor subdirs and prefer Debian standard DTB path with usrmerge fallback; build-rootfs: bypass zz-update-grub systemd guard in chroot#133

bjordiscollaku merged 4 commits intomainqualcomm-linux/qcom-build-utils:mainfrom

fix/pkg-linux-qcom-boot-tools-compatqualcomm-linux/qcom-build-utils:fix/pkg-linux-qcom-boot-tools-compatCopy head branch name to clipboard