sci: load kvm modules via modules-load.d to fix libvirtd boot race

libvirtd's Cloud Hypervisor driver does a one-time /dev/kvm existence
check at init (ch_conf.c). If /dev/kvm doesn't exist at that moment
the driver is permanently skipped with no retry.

kvm_amd/kvm_intel are loaded by udev (non-deterministic), not by
systemd-modules-load.service (which runs Before=sysinit.target).
This creates a race: libvirtd can start before /dev/kvm is created.

Adding kvm.conf to modules-load.d moves loading to
systemd-modules-load.service, which is guaranteed to complete before
libvirtd starts (via the sysinit.target -> multi-user.target chain).
The arch-mismatched module fails harmlessly with -EOPNOTSUPP.

Fixes intermittent CI failures in Test CloudHypervisor jobs.

Author: anokfireball

features/sci/file.include/etc/modules-load.d/kvm.conf

@@ -0,0 +1,3 @@
+kvm
+kvm_amd
+kvm_intel