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>
diff --git a/common/kgdb.c b/common/kgdb.c
index 312e149..4493a15 100644
--- a/common/kgdb.c
+++ b/common/kgdb.c
@@ -88,6 +88,7 @@
  ****************************************************************************/
 
 #include <common.h>
+#include <asm/ptrace.h>
 
 #include <kgdb.h>
 #include <command.h>
diff --git a/common/kgdb_stubs.c b/common/kgdb_stubs.c
index c061126..66aed7c 100644
--- a/common/kgdb_stubs.c
+++ b/common/kgdb_stubs.c
@@ -11,6 +11,7 @@
 #include <cpu_func.h>
 #include <kgdb.h>
 #include <serial.h>
+#include <asm/ptrace.h>
 
 int (*debugger_exception_handler)(struct pt_regs *);