um: clean up the includes in ubd

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Richard Weinberger <richard@nod.at>
diff --git a/arch/um/drivers/ubd_user.c b/arch/um/drivers/ubd_user.c
index 007b94d..ffe02c4 100644
--- a/arch/um/drivers/ubd_user.c
+++ b/arch/um/drivers/ubd_user.c
@@ -15,14 +15,12 @@
 #include <sys/socket.h>
 #include <sys/mman.h>
 #include <sys/param.h>
-#include "asm/types.h"
-#include "ubd_user.h"
-#include "os.h"
-#include "cow.h"
-
 #include <endian.h>
 #include <byteswap.h>
 
+#include "ubd.h"
+#include "os.h"
+
 void ignore_sigwinch_sig(void)
 {
 	signal(SIGWINCH, SIG_IGN);