VMCI: include slab.h into files using kmalloc/kfree

Do not rely on implicit header dependencies as they are known to
break.

Reported-by: Randy Dunlap <[e-mail]>
Acked-by: Andy King <[e-mail]>
Signed-off-by: Dmitry Torokhov <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/misc/vmw_vmci/vmci_guest.c

···
 #include <linux/interrupt.h>
 #include <linux/highmem.h>
 #include <linux/kernel.h>
+#include <linux/mm.h>
 #include <linux/module.h>
 #include <linux/sched.h>
+#include <linux/slab.h>
 #include <linux/init.h>
 #include <linux/pci.h>
 #include <linux/smp.h>
 #include <linux/io.h>
+#include <linux/vmalloc.h>
 
 #include "vmci_datagram.h"
 #include "vmci_doorbell.h"

drivers/misc/vmw_vmci/vmci_host.c

···
 #include <linux/module.h>
 #include <linux/mutex.h>
 #include <linux/sched.h>
+#include <linux/slab.h>
 #include <linux/file.h>
 #include <linux/init.h>
 #include <linux/poll.h>