um: get rid of pointless include "..." where include <...> will do

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Richard Weinberger <richard@nod.at>
diff --git a/arch/um/include/asm/dma.h b/arch/um/include/asm/dma.h
index 9f6139a..f88c586 100644
--- a/arch/um/include/asm/dma.h
+++ b/arch/um/include/asm/dma.h
@@ -1,7 +1,7 @@
 #ifndef __UM_DMA_H
 #define __UM_DMA_H
 
-#include "asm/io.h"
+#include <asm/io.h>
 
 extern unsigned long uml_physmem;