common: Drop asm/ptrace.h from common header

Move this uncommon header out of the common header.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/common/bedbug.c b/common/bedbug.c
index 42ecf61..18a35ca 100644
--- a/common/bedbug.c
+++ b/common/bedbug.c
@@ -1,6 +1,7 @@
 /* $Id$ */
 
 #include <common.h>
+#include <asm/ptrace.h>
 
 #include <linux/ctype.h>
 #include <bedbug/bedbug.h>