[ARM] remove asm/ptrace.h from asm/thread_info.h

asm/thread_info.h doesn't need asm/ptrace.h, remove it.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/include/asm-arm/thread_info.h b/include/asm-arm/thread_info.h
index eae85b0..69c65d5 100644
--- a/include/asm-arm/thread_info.h
+++ b/include/asm-arm/thread_info.h
@@ -24,7 +24,6 @@
 struct task_struct;
 struct exec_domain;
 
-#include <asm/ptrace.h>
 #include <asm/types.h>
 #include <asm/domain.h>