char: misc: Call misc_init() early when CONFIG_INITCALL_ASYNC=y

rfkill_init() depends on misc_init() to init misc_class.
But rfkill_init() and misc_init() are both in the same
subsys_initcall level.

Fix this by move misc_init() to the arch_initcall_sync level.

Change-Id: I7266c2787c04a42886816b0ef11f3ed968ebf557
Signed-off-by: Tao Huang <huangtao@rock-chips.com>

drivers/char/misc.c

@@ -290,4 +290,8 @@ fail_remove:
 		remove_proc_entry("misc", NULL);
 	return err;
 }
+#ifdef CONFIG_INITCALL_ASYNC
+arch_initcall_sync(misc_init);
+#else
 subsys_initcall(misc_init);
+#endif