Re-enable kdump test on QEMU, x86_64 & aarch64 only

This is currently broken on cloud platforms but should work in QEMU in
CI on x86_64 & aarch64.

See coreos/fedora-coreos-tracker#860

This reverts commit 1e707cd.

tests/kola/kdump/test.sh

@@ -1,12 +1,9 @@
 #!/bin/bash
 set -xeuo pipefail
 # https://docs.fedoraproject.org/en-US/fedora-coreos/debugging-kernel-crashes/
-# kola: {"minMemory": 4096, "tags": "skip-base-checks"}
-
-# ===== FIXME: Disabled due to broken CI
-echo "Test disabled"
-exit 0
-# =====
+# Only run on QEMU and x86_64 & aarch64 for now:
+# https://github.com/coreos/fedora-coreos-tracker/issues/860
+# kola: {"platforms": "qemu-unpriv", "minMemory": 4096, "tags": "skip-base-checks", "architectures": "x86_64 aarch64"}
 
 fatal() {
     echo "$@" >&2