miscdevice: introduce builtin_misc_device

This is basically the same as module_misc_device but without the
presence of an exit/remove function.   Similar in nature to the
commit f309d444 ("platform_device:
better support builtin boilerplate avoidance").

Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: NPaul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

include/linux/miscdevice.h

@@ -71,6 +71,13 @@ struct miscdevice  {
 extern int misc_register(struct miscdevice *misc);
 extern void misc_deregister(struct miscdevice *misc);
 
+/*
+ * Helper macro for drivers that don't do anything special in the initcall.
+ * This helps in eleminating of boilerplate code.
+ */
+#define builtin_misc_device(__misc_device) \
+	builtin_driver(__misc_device, misc_register)
+
 /*
  * Helper macro for drivers that don't do anything special in module init / exit
  * call. This helps in eleminating of boilerplate code.