dm vdo: include <asm/current.h> to resolve current being undeclared

Reported when building on loongarch.
Reported-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
Signed-off-by: Bruce Johnston <bjohnsto@redhat.com>
Signed-off-by: Matthew Sakai <msakai@redhat.com>

drivers/md/dm-vdo/logger.c

@@ -5,6 +5,7 @@
 
 #include "logger.h"
 
+#include <asm/current.h>
 #include <linux/delay.h>
 #include <linux/hardirq.h>
 #include <linux/module.h>

drivers/md/dm-vdo/thread-registry.c

@@ -5,6 +5,7 @@
 
 #include "thread-registry.h"
 
+#include <asm/current.h>
 #include <linux/rculist.h>
 
 #include "permassert.h"

drivers/md/dm-vdo/thread-utils.c

@@ -5,6 +5,7 @@
 
 #include "thread-utils.h"
 
+#include <asm/current.h>
 #include <linux/delay.h>
 #include <linux/kthread.h>
 #include <linux/mutex.h>