Fix build on NetBSD 8.99.38
With recent changes the dev/nvmm/nvmm_ioctl.h header is no longer
a standalone NVMM header. Disable it until the NVMM operations will
stabilize and be included in the ioctl(2) interceptors.
#include <dev/isa/isvio.h>
#include <dev/isa/wtreg.h>
#include <dev/iscsi/iscsi_ioctl.h>
+#if 0
#include <dev/nvmm/nvmm_ioctl.h>
+#endif
#include <dev/ofw/openfirmio.h>
#include <dev/pci/amrio.h>
#include <dev/pci/mlyreg.h>
