tests: Disable spidev on big-endian 32-bit platforms #1182

Job	Run time
OS (apt-docker.io/amd64/ubuntu:devel)	2m 10s
OS (apt-docker.io/amd64/ubuntu:latest)	1m 56s
OS (apt-docker.io/amd64/ubuntu:rolling)	1m 55s
OS (apt-docker.io/i386/debian:testing)	2m 3s
OS (apt-docker.io/amd64/debian:testing)	2m 4s
OS (dnf-registry.fedoraproject.org/fedora:latest)	28m 41s
OS (dnf-registry.fedoraproject.org/fedora:rawhide)	2m 4s
OS (alpine-docker.io/alpine)	30s
OS (alpine-docker.io/i386/alpine)	30s
OS ([email protected]/alpine)	29s
OS (nix-docker.io/nixos/nix)	1m 12s
OS (gentoo-)	20m 36s
OS (alpine@gudev-alpine, EXTRA_PACKAGES=libgudev-dev)	33s
	1h 4m 43s

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