Add sys/systm.h to several places that use vm headers.

It is needed (but not enough) to use e.g. KASSERT() in inline functions.

Sponsored by:	The FreeBSD Foundation
MFC after:	1 week

sys/cddl/compat/opensolaris/kern/opensolaris_vm.c

@@ -28,6 +28,7 @@
 __FBSDID("$FreeBSD$");
 
 #include <sys/param.h>
+#include <sys/systm.h>
 #include <sys/lock.h>
 #include <sys/freebsd_rwlock.h>
 

sys/compat/cloudabi/cloudabi_vdso.c

@@ -26,7 +26,8 @@
 #include <sys/cdefs.h>
 __FBSDID("$FreeBSD$");
 
-#include <sys/types.h>
+#include <sys/param.h>
+#include <sys/systm.h>
 #include <sys/lock.h>
 #include <sys/sysent.h>
 #include <sys/rwlock.h>