src/dmiperf: Include sys/types.h for u_int32_t

src/dmiperf: Include sys/types.h for u_int32_t

u_int32_t type is defined in sys/types.h, which is often included by
glibc implicitly when some other headers are used, but other C
libraries such as musl may not necessarily do so, therefore an
explicit include is needed.

Signed-off-by: Rostislav Skudnov <rostislav@tuxera.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Eryu Guan <eguan@redhat.com>