kernel: measured rootfs as argument to build-kernel.sh

By convention the caller of tools/packaging/kernel/build-kernel.sh changes
the script behavior by passing arguments, whereas, for measured rootfs
it has used an environment variable (MEASURED_ROOTFS). This refactor
the script so that the caller now must pass the "-m" argument to enable
the build of the kernel with measured rootfs support.

Fixes #6674
Signed-off-by: Wainer dos Santos Moschetta <wainersm@redhat.com>

tools/packaging/kata-deploy/local-build/kata-deploy-binaries.sh

@@ -300,7 +300,7 @@ install_cached_kernel_tarball_component() {
 install_kernel_helper() {
 	local kernel_version_yaml_path="${1}"
 	local kernel_name="${2}"
-	local extra_cmd=${3}
+	local extra_cmd="${3:-}"
 
 	export kernel_version="$(get_from_kata_deps ${kernel_version_yaml_path})"
 	export kernel_kata_config_version="$(cat ${repo_root_dir}/tools/packaging/kernel/kata_config_version)"
@@ -317,6 +317,9 @@ install_kernel_helper() {
 	if [ "${MEASURED_ROOTFS}" == "yes" ]; then
 		info "build initramfs for cc kernel"
 		"${initramfs_builder}"
+		# Turn on the flag to build the kernel with support to
+		# measured rootfs.
+		extra_cmd+=" -m"
 	fi
 
 	info "build ${kernel_name}"