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/sys-ppc/shared/sysdep/ptrace.h b/arch/um/sys-ppc/shared/sysdep/ptrace.h
index 0e3230e..efe0c1a 100644
--- a/arch/um/sys-ppc/shared/sysdep/ptrace.h
+++ b/arch/um/sys-ppc/shared/sysdep/ptrace.h
@@ -5,7 +5,7 @@
 #ifndef __SYS_PTRACE_PPC_H
 #define __SYS_PTRACE_PPC_H
 
-#include "linux/types.h"
+#include <linux/types.h>
 
 /* the following taken from <asm-ppc/ptrace.h> */