lguest: Use explicit includes rateher than indirect

explicitly use ktime.h include
explicitly use hrtimer.h include
explicitly use sched.h include

This patch adds headers explicitly to lguest sources file,
to avoid depending on them being included somewhere else.
Signed-off-by: NGlauber de Oliveira Costa <gcosta@redhat.com>
Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>

drivers/lguest/hypercalls.c

@@ -23,6 +23,7 @@
 #include <linux/uaccess.h>
 #include <linux/syscalls.h>
 #include <linux/mm.h>
+#include <linux/ktime.h>
 #include <asm/page.h>
 #include <asm/pgtable.h>
 #include "lg.h"

drivers/lguest/lg.h

@@ -8,6 +8,7 @@
 #include <linux/lguest.h>
 #include <linux/lguest_launcher.h>
 #include <linux/wait.h>
+#include <linux/hrtimer.h>
 #include <linux/err.h>
 #include <asm/semaphore.h>
 

drivers/lguest/lguest_user.c

@@ -6,6 +6,7 @@
 #include <linux/uaccess.h>
 #include <linux/miscdevice.h>
 #include <linux/fs.h>
+#include <linux/sched.h>
 #include "lg.h"
 
 /*L:055 When something happens, the Waker process needs a way to stop the