mips: separate extable.h, switch module.h to it

more victims of indirect include chains - au1200fb
lasat/picvue_proc and watchdog/ath79_wdt

... as well as tb0219, spotted by Sudip Mukherjee

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/arch/mips/lasat/picvue_proc.c b/arch/mips/lasat/picvue_proc.c
index 27533c1..dd292dc 100644
--- a/arch/mips/lasat/picvue_proc.c
+++ b/arch/mips/lasat/picvue_proc.c
@@ -16,6 +16,7 @@
 
 #include <linux/timer.h>
 #include <linux/mutex.h>
+#include <linux/uaccess.h>
 
 #include "picvue.h"