File _multibuild of Package kernel-source-vanilla

<multibuild>
	<package>dtb-aarch64</package>
	<package>dtb-armv6l</package>
	<package>dtb-armv7l</package>
	<package>dtb-riscv64</package>
	<package>kernel-obs-build</package>
	<package>kernel-obs-qa</package>
	<package>kernel-vanilla</package>
</multibuild>