kernel/freebsd: fix module build on latest head

Internal changes in the freebsd kernel have meant that additional includes
are now necessary to build the kernel modules for DPDK. Tested with latest
bsd HEAD revision.

Bugzilla ID: 282
Cc: stable@dpdk.org

Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>

kernel/freebsd/contigmem/contigmem.c

@@ -13,10 +13,13 @@ __FBSDID("$FreeBSD$");
 #include <sys/malloc.h>
 #include <sys/module.h>
 #include <sys/proc.h>
+#include <sys/lock.h>
 #include <sys/rwlock.h>
+#include <sys/mutex.h>
 #include <sys/systm.h>
 #include <sys/sysctl.h>
 #include <sys/vmmeter.h>
+#include <sys/eventhandler.h>
 
 #include <machine/bus.h>
 

kernel/freebsd/nic_uio/nic_uio.c

@@ -11,6 +11,7 @@ __FBSDID("$FreeBSD$");
 #include <sys/bus.h> /* structs, prototypes for pci bus stuff and DEVMETHOD */
 #include <sys/rman.h>
 #include <sys/systm.h>
+#include <sys/lock.h>
 #include <sys/rwlock.h>
 #include <sys/proc.h>