module.h: relocate MODULE_PARM_DESC into moduleparam.h

There are files which use module_param and MODULE_PARM_DESC
back to back.  They only include moduleparam.h which makes sense,
but the implicit presence of module.h everywhere hid the fact
that MODULE_PARM_DESC wasn't in moduleparam.h at all.  Relocate
the macro to moduleparam.h so that the moduleparam infrastructure
can be used independently of module.h

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
diff --git a/include/linux/moduleparam.h b/include/linux/moduleparam.h
index fffb10b..7939f63 100644
--- a/include/linux/moduleparam.h
+++ b/include/linux/moduleparam.h
@@ -31,6 +31,11 @@
 #define __MODULE_PARM_TYPE(name, _type)					  \
   __MODULE_INFO(parmtype, name##type, #name ":" _type)
 
+/* One for each parameter, describing how to use it.  Some files do
+   multiple of these per line, so can't just use MODULE_INFO. */
+#define MODULE_PARM_DESC(_parm, desc) \
+	__MODULE_INFO(parm, _parm, #_parm ":" desc)
+
 struct kernel_param;
 
 struct kernel_param_ops {