Disable LTTNGMODULES on qemuarm due to do_create_runtime_spdx

Disable LTTNGMODULES on qemuarm due to do_create_runtime_spdx

There is a race in the function do_create_runtime_spdx that
shows in qemuarm builds in particular.
Disable this in CI.

Bug-AGL: SPEC-4956
Change-Id: I152dbbbffc48b510260e45be3a1e84f2e9772ae5
Signed-off-by: Jan-Simon Möller <jsmoeller@linuxfoundation.org>
Reviewed-on: https://gerrit.automotivelinux.org/gerrit/c/AGL/meta-agl/+/29883
Tested-by: Jenkins Job builder account
ci-image-build: Jenkins Job builder account
ci-image-boot-test: Jenkins Job builder account