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: Paul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>