[MIPS] Fix errors detected by "make headers_check"

* export asm/sgidefs.h
* include asm/isadep.h only if in kernel
* do not export contents of asm/timex.h and asm/user.h

Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/include/asm-mips/ptrace.h b/include/asm-mips/ptrace.h
index 4113316..4fb0fc4 100644
--- a/include/asm-mips/ptrace.h
+++ b/include/asm-mips/ptrace.h
@@ -10,8 +10,6 @@
 #define _ASM_PTRACE_H
 
 
-#include <asm/isadep.h>
-
 /* 0 - 31 are integer registers, 32 - 63 are fp registers.  */
 #define FPR_BASE	32
 #define PC		64
@@ -73,6 +71,7 @@
 #ifdef __KERNEL__
 
 #include <linux/linkage.h>
+#include <asm/isadep.h>
 
 /*
  * Does the process account for user or for system time?