sh: dwarf unwinder needs linux/module.h.

Previously the struct module definition was pulled in from other headers,
but we want the reference to be explicit. Fixes up randconfig build
issues.
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

arch/sh/kernel/dwarf.c

@@ -22,6 +22,7 @@
 #include <linux/mm.h>
 #include <linux/elf.h>
 #include <linux/ftrace.h>
+#include <linux/module.h>
 #include <asm/dwarf.h>
 #include <asm/unwinder.h>
 #include <asm/sections.h>